Definition (Reference)

Internal haze/volatile fogging is a diffuse film or whitish veil deposited on IGU cavity faces (usually #2 / #3), arising from outgassing or volatile transport within the sealed unit. Because the cue resides between panes, it is not accessible to in-place restoration; classification is driven by location/condition rather than surface catch. Identify cavity faces by surface numbering and verify between-pane status via fixed parallax.

Typical Presentation (Informative)

Field Identification Cues (Normative)

Location / access (primary):

Surface-catch class (MSRT):

Visual signature (exposed faces):

Classification Mapping (to VIS-DA) (Normative)

Indicative Relief / Depth (Informative)

Differentiation & False Positives (Informative)

Evidence Package (Documentation Requirements) (Normative)

Mis-ID Pitfalls (Informative)

Attempting spot-work on #1/#4 to “chase” a between-pane haze creates a worked region with a visible transition edge, which VIS disallows at acceptance (CAT-0…CAT-4). Confirm parallax before any action.

Reporting Language (Template)

Definition (Reference)

Between-pane condensation is liquid water or condensate films/droplets observed on IGU cavity faces (typically #2 / #3) due to moisture ingress, seal failure, or internal humidity/temperature cycling. Because the cue resides inside the sealed unit, it is not accessible to in-place restoration; classification is governed by location/condition rather than surface-catch. Identify cavity faces via surface numbering and verify between-pane status by fixed parallax.

Typical Presentation (Informative)

Field Identification Cues (Normative)

Location / access (primary):

Surface-catch class (MSRT):

Inspection environment / reveal controls:

Viewing / lighting:

Classification Mapping (to VIS-DA) (Normative)

Indicative Relief / Depth (Informative)

Differentiation & False Positives (Informative)

Evidence Package (Documentation Requirements) (Normative)

Mis-ID Pitfalls (Informative)

Attempting to work #1/#4 to “remove” a between-pane wetting artifact will create a worked region with a visible transition edge, which VIS disallows at acceptance (CAT-0…CAT-4). Confirm parallax and environmental dryness before any action.

Reporting Language (Template)

DSS-A.01.03 — Desiccant Dust / Fines in IGU Cavity

Definition (Reference)

Particulate fines (typically white/gray) released from or tracked by the spacer/desiccant system within an insulating glass unit (IGU) cavity. Presents on cavity faces (#2 and/or #3) and is not accessible in-place. IGU surface numbering and “between-pane” determination follow the VIS conventions.

Typical Presentation (Informative)

Field Identification Cues (Normative)

Viewing / Lighting (use VIS)

Evaluate at 12 / 36 / 72 in with normal incidence + oblique sweep (~60°–120°) under raking light; surfaces must be clean/dry (Non-Invasive Reveal) to exclude face-side residues.

Classification Mapping (to VIS-DA) (Normative)

Indicative Depth / Relief (Informative)

Not applicable as a surface-relief quantity on the exposed faces. The feature resides on #2/#3 cavity faces or within the spacer/cavity environment; field acceptance remains appearance-only and location-based under VIS.

Differentiation & False Positives (Informative)

Evidence Package (Documentation Requirements) (Normative)

Reporting Language (Template)

A.01.03 Desiccant Dust/Fines (IGU Cavity) — Discrete particulate visible on #2/#3 faces confirmed by fixed parallax under VIS geometry. Non-responsive to Non-Invasive Reveal; MSRT not applicable to cavity faces. CAT-5 (between-pane; out of in-place scope). Documented with photo set and surface numbering; refer to manufacturer/warranty per project protocol.

Definition (Reference)

Non-uniform appearance change (e.g., patchiness, color shift/iridescence, fine “islands”/pinholes, micro-mottle) on a functional coating located on IGU cavity faces (#2 or #3). Because the affected face is between panes, it is not an exposed worked surface and is not addressable in-place; classification is governed by location/condition. VIS defines surface numbering and treats between-pane (fixed parallax) cues as out-of-scope by location. “Coating anomaly” is a defined VIS term (adapted from ASTM C1376).

Typical Presentation (Informative)

Field Identification Cues (Normative)

Location / access (primary):

Surface-catch class (MSRT):

Inspection environment / reveal controls:

Viewing / lighting:

Classification Mapping (to VIS-DA) (Normative)*

Indicative Relief / Depth (Informative)

Differentiation & False Positives (Informative)

Evidence Package (Documentation Requirements) (Normative)*

Mis-ID Pitfalls (Informative)

Attempting to “correct” a cavity coating anomaly on the exposed face risks creating a worked region (visible transition edge) that VIS disallows at acceptance for CAT-0…CAT-4. Confirm parallax and reveal status before any action.

Reporting Language (Template)

Definition (Reference)

Characteristic staining or streaking patterns deposited on IGU cavity faces (usually #2 / #3) associated with breather/altitude-tube ports used during fabrication/shipping/altitude equalization. By location (between panes), these cues are not on an exposed worked face and are not addressable in place; classification is therefore location/condition-driven. This entry follows VIS surface numbering and between-pane verification by fixed parallax.

Typical Presentation (Informative)

• Localized halos, arcs, or drip-like streaks emanating from or near the tube entry/sightline, commonly along the perimeter; tone may be translucent, slightly glossy, or matte.
• No change after Non-Invasive Reveal of the exposed faces; persists in identical position when viewed at different angles (i.e., parallax-fixed between the panes).

Field Identification Cues (Normative)

Location / access (primary):

• Identify faces via surface numbering (#1–#4). Demonstrate between-pane location by fixed parallax (feature remains stationary relative to its reflection as the observer moves). If confirmed, classify CAT-5 by location.

Surface-catch class (MSRT):

• Not determinative for a cavity-face cue. MSRT is for exposed faces only and is a single, non-marring pass to support classification—not acceptance. On the exposed face, record SC-0 (no relief) if checked.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) on the exposed surface(s) before evaluation; if the cue persists unchanged, that supports a cavity origin. Do not use blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• Apply VIS geometry: 12 / 36 / 72 in; normal incidence + oblique sweep (~60°–120°) with raking light. Include perimeter shots that show the cue’s relationship to the likely tube location.

Classification Mapping (to VIS-DA) (Normative)*

• CAT-5 — Out of scope for in-place restoration when the staining resides on #2/#3 (between panes). Document and refer per project protocol (manufacturer/warranty/replacement).

Indicative Relief / Depth (Informative)

• No accessible relief on the exposed face (SC-0 if checked). Apparent “depth” is within the cavity; numeric surface depth on the exposed face is not applicable.

Differentiation & False Positives (Informative)

• vs. Spacer smear/bleed (A.01.04): Spacer smear typically forms continuous bands parallel to the spacer; breather-tube staining often radiates from a point/port or short perimeter segment. Both are CAT-5 by location—document geometry and parallax.
• vs. Internal haze/volatile fogging (A.01.01): Fogging is a diffuse veil across a broader field; tube staining is localized with identifiable origin. Use parallax and perimeter context.
• vs. Face-side residue (R-family): Face films respond to reveal; cavity staining does not. Confirm with reveal and fixed parallax.

Evidence Package (Documentation Requirements) (Normative)*

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include a parallax sequence and perimeter frames that show the tube/port adjacency.
2. Forms: Record pane ID, product family & surface numbering (#1–#4; laminate-internal), worked surface Y/N, functional coating present on worked surface? (Y/N/Unknown), reveal status, lighting/time, geometry checklist.
3. Narrative split: “Between-pane perimeter staining consistent with breather/altitude-tube origin on #2/#3; CAT-5 by location; refer per protocol.”

Mis-ID Pitfalls (Informative)

Attempting to “clean” a cavity artifact from the exposed face risks creating a worked region (visible transition edge), which VIS disallows at acceptance for CAT-0…CAT-4. Confirm reveal status and parallax before any action.

Reporting Language (Template)

• A.01.06 Breather/Altitude-Tube Staining (Cavity #2/#3) — Localized perimeter staining consistent with tube/port origin; parallax-fixed between panes; no change after Non-Invasive Reveal; MSRT not applicable to cavity face. CAT-5 (out of in-place scope by location). Documented per VIS geometry; refer per project protocol.

Definition (Reference)

A milky, desaturated band or clouding that develops within the laminated interlayer zone near the perimeter, typically within a few millimeters to several centimeters of the edge. It is an internal condition (between glass plies) of laminated glass and not a worked-surface defect. Because it is laminate-internal, it is generally out of in-place restoration scope; document and refer. (Laminated glass & interlayer context: ASTM C1172; ISO 12543.

Typical presentation (Informative)

• Semi-opaque “whitening” ribbon along edges; may appear wedge-shaped or uneven in width around corners.
• Can grow/recall with humidity and temperature changes; does not respond to non-invasive reveal/cleaning.
• May co-present with micro-bubbles/stringers or with slight interlayer retreat at the edge.
• Readable at normal incidence and oblique sweep under raking light; often more visible at standard/wide-field views when back-lit. (Inspection geometry & raking light: VIS §5.3–§5.4.

Field Identification Cues (Normative)

• Surface-catch class (MSRT): None on either exposed face. One light, non-marring pass per VIS §5.5; do not abrade. (MSRT definition and use.
• Visual signature: Edge-parallel, diffuse whitening inside the laminate; no chip-flank sparkle, no pits/craters at the exposed face; persists after non-invasive reveal. (Reveal.
• Location / access: Laminate-internal (between plies). Record surface numbering for the lite(s) and note that the observation is laminate-internal rather than on #1/#4 faces. (Surface numbering & non-exposed surfaces.
• Diagnostic differentiators:

• vs. external eolian/cleaning haze: external fields show face-side cues and may produce surface catch or directional patterning; laminate whitening does not.
• vs. sealant/adhesive film: surface films respond to reveal; laminate whitening does not.
• vs. local delamination (A.02.06): delamination shows a defined boundary (often iridescence, Newton fringes) and may include discrete voids; edge whitening is diffuse without a sharp lensing boundary.

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 (Out of in-place scope): Record as A.02.01 — Laminate-internal whitening (CAT-5) and refer to fabricator/manufacturer or replacement per project protocol. (CAT-5 scope & rationale.
• If any face-side damage is also present (e.g., mechanical scoring at the perimeter), classify that separately under the appropriate M-family item and assign CAT per VIS. (Three-part cueing & boundary guidance.

Indicative depth range (μm)

Not applicable (internal to laminate). Depth ranges in μm apply to worked-surface defects; laminated interlayer whitening has no meaningful face-side removal depth.

Evidence & documentation (Informative)

• Photos: overview of the lite; edge runs at mid-range; close-ups at raking light. Include one back-lit image when safe, to show internal character. (VIS documentation.
  
• Recording: pane ID, surface numbering (#1–#4 / laminate-internal), environment (temp/RH), width of whitening band at several stations. (Surface numbering & documentation prompts.
• Inspection conditions: confirm non-invasive reveal completed; inspect under VIS §5 lighting/geometry; MSRT recorded as none. (Reveal & geometry.

Associated references (Informative)

• Product/spec context: ASTM C1172 (laminated architectural flat glass); ISO 12543 (laminated glass series). (Listed in VIS references.
• VIS cross-refs: Terminology (laminated, non-exposed surface); §5 (inspection), §6 (acceptance), §4.2.6 (CAT-5). (Terminology & sections.
  

Definition (Reference)

Discrete bubbles (rounded voids) or stringers (elongate/filamentary voids) within the laminated interlayer (between plies). These are laminate-internal features—not on an exposed worked face—and are therefore not addressable in place; classification is location/condition-driven. Product/spec context for laminated glass: ASTM C1172; ISO 12543. Surface numbering: identify as laminate-internal (distinct from #1/#4 and IGU #2/#3 faces).

Typical Presentation (Informative)

• Isolated, round entrapped gas pockets; or linear “stringers” oriented with cut/lay-up flow.
• Concentrated near edges/corners, along insert/print boundaries, or sporadically in field.
• No change after Non-Invasive Reveal of exposed faces; no worked transition edge on the face. (Reveal & inspection geometry per VIS §5.)

Field Identification Cues (Normative)

Location / access (primary):

• Confirm laminate-internal location. On project forms, record product family (laminated) and surface numbering (#1–#4; laminate-internal). Do not assign face numbers to laminate-internal interfaces unless a project spec requires it.

Surface-catch class (MSRT):

• SC-0 (none) on the exposed face(s). MSRT is a single, non-marring pass used only to support classification—not acceptance. Do not abrade.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) prior to evaluation; persistence confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• VIS geometry: 12 / 36 / 72 in; normal incidence + oblique sweep (~60°–120°) with raking light. Back-lit frames can help show void boundaries.

Classification Mapping (to VIS-DA) (Normative)*

• CAT-5 — Out of in-place scope when features are laminate-internal (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).

Indicative Relief / Depth (Informative)

• Not applicable to the exposed face (no measurable surface relief; SC-0). Numeric μm depth ranges apply to face-side defects only.

Differentiation & False Positives (Informative)

• vs. Seeds/blisters in float glass (P.02.02): Factory gas inclusions within monolithic glass; encapsulated and SC-0 on the face; classify under processing feature entries, not laminated interlayer.
• vs. Adhesive/film domes (R-family) on #1/#4: Face-side residues respond to Non-Invasive Reveal; laminate-internal bubbles do not.
• vs. Local delamination (A.02.06): Delamination often shows defined boundary (Newton fringes/iridescence) or creep; bubbles/stringers are discrete voids without broad separation. (Use VIS geometry + reveal to separate.)

Evidence Package (Documentation Requirements) (Normative)*

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; add one back-lit close-up (when safe) to show void boundaries.
   
2. Forms: Pane ID; product family & surface numbering (#1–#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
3. Measurements (if requested): Approximate void size (mm), count per area, and distance from edge; note temperature/RH at time of inspection (for reproducibility). (Use VIS forms fields; add notes.)

Mis-ID Pitfalls (Informative)

Attempting “spot-work” on the face to address an internal void risks creating a worked region (visible transition edge) that VIS disallows at acceptance for CAT-0…CAT-4. Keep classification appearance-only and location-based; refer.

Reporting Language (Template)

• A.02.02 Bubbles/Stringers (laminate-internal) — Discrete voids within interlayer; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking. CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.

Definition (Reference)

Discrete foreign particles/fibers/particulates encapsulated within the laminated interlayer between glass plies (e.g., dust, fabric lint, granules, hairline fibers). These are laminate-internal features—not on an exposed worked face—and are therefore not addressable in place; classification is location/condition-driven. Product/spec context for laminated glass: ASTM C1172 and ISO 12543 (normative in VIS). Use VIS surface numbering; identify as laminate-internal (distinct from #1/#4 and IGU #2/#3 faces).

Typical Presentation (Informative)

• Point-like specks (dark/opaque), light-colored lint, or fine filaments captured in the interlayer; may align with lay-up direction or appear clustered near edges/inserts.
• No change after Non-Invasive Reveal of exposed faces and no worked transition edge on the face. Evaluate using VIS lighting/geometry.

Field Identification Cues (Normative)

Location / access (primary):

• Confirm laminate-internal location. On forms, record product family (laminated) and surface numbering (#1–#4; laminate-internal). Do not re-number laminate-internal faces as IGU faces.

Surface-catch class (MSRT):

• SC-0 (none) on exposed face(s). MSRT is single, non-marring and used only to support classification—not acceptance. Do not abrade.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) before evaluation; persistence confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• VIS geometry: 12 / 36 / 72 in; normal incidence + oblique sweep (~60°–120°) under raking light. Back-lit frames can help show particle silhouette.

Classification Mapping (to VIS-DA) (Normative)*

• CAT-5 — Out of in-place scope when inclusions are laminate-internal (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).

Indicative Relief / Depth (Informative)

• Not applicable to the exposed face (no measurable surface relief; SC-0). VIS μm ranges apply to face-side defects only.

Differentiation & False Positives (Informative)

• vs. Face-side residues/overspray (R-family): Face films respond to Non-Invasive Reveal; true inclusions do not.
• vs. Stones/knots in float (P.02.03): Factory solid inclusions in the glass mass (processing feature); encapsulated and SC-0 on the face. Classify per processing features, not laminated interlayer contamination.
• vs. Bubbles/stringers (A.02.02): Gas voids without foreign matter; contamination inclusions show solid particulate/fiber boundaries. Keep the family assignment distinct; both are laminate-internal and typically CAT-5.
  

Evidence Package (Documentation Requirements) (Normative)*

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include a back-lit close-up (when safe) to show inclusion boundary; ensure reveal completed is noted.
2. Forms: Pane ID; product family & surface numbering (#1–#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
3. Optional measurements: Approximate particle size (mm), count per area, distance from edge; note temperature/RH at time of inspection. (Use VIS form notes.)

Mis-ID Pitfalls (Informative)

Attempting “spot-work” on the face to address an internal inclusion risks creating a worked region (visible transition edge) that VIS disallows at acceptance for CAT-0…CAT-4. Keep classification appearance-only and location-based; refer.

Reporting Language (Template)

• A.02.03 Contamination Inclusions (laminate-internal) — Discrete foreign particulate/fiber within interlayer; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking. CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.

Definition (Reference)

Localized flow, squeeze-out, or exposure of the laminated interlayer at or near the laminate edge. Presents as soft or glossy interlayer material visible at the ply edges; may wet adjacent components or leave a faint transfer on adjacent framing or gaskets. Because the condition originates within the laminate stack (between plies), it is not a face-side glass surface defect. The laminate’s internal faces are “laminate-internal” and are not accessible for in-place restoration.

Typical Presentation (Informative)

• Soft or tacky bead/film emerging at the edge; sometimes clear, sometimes slightly hazed from dust pickup.
• May print or smudge onto adjacent frame gaskets; can trap debris along the edge line.
• Often intermittent along the perimeter; more pronounced at corners or areas exposed to heat/sunload.
• No discrete “line” or chip-flank morphology on the glass face; effect is edge-localized and internal to the laminate. (Use surface numbering and location cues to confirm laminate-internal origin.)

Field Identification Cues (Normative)

• Location/access: Confirm the observation is at the laminate edge and originates between plies (laminate-internal). Record surface numbering and product type on Forms: If the cue is not on the exposed face and shows fixed parallax (where applicable), treat as out-of-scope for in-place restoration.
• Non-invasive reveal: Clean and dry the exposed face per VIS before evaluating; edge ooze will not be removed by a face-side reveal, though incidental transfer on the face may wipe away.
• MSRT (Manual Surface-Relief Test): On the face, one light, non-marring pass only. Expect SC-0 on the face (no relief) unless there is a separate residue on the face; classification remains location-driven. Prefer polymer stylus if a coating is present on the worked face or rely on visual cues.
• Viewing/lighting: Evaluate at 12 / 36 / 72 in using normal incidence + oblique sweep (~60°–120°) under raking light; document the edge zone and overall context.

Classification Mapping (to VIS-DA) (Normative)

• Default: CAT-5 by location/condition — the condition is between plies (laminate-internal) and not addressable on the exposed face in place. Document and refer per project protocol.
• Escalate/branch when:
  • Face residue/transfer is present from the ooze (e.g., on the frame or a smear on the glass face): classify the face residue under the appropriate R.01 / R.05 DSS entry (residue/transfer) by CAT using face-side cues; the source condition (internal ooze) remains CAT-5.
  • Edge damage or cracking is also observed: classify those features under M.03 / M.07 as applicable, separate from the laminate-internal ooze.

Indicative Relief / Depth (Informative)

Not a glass face relief feature. On the exposed face, MSRT typically records SC-0 (no surface catch) unless a separate residue is present. Numeric depth in glass (µm) is not applicable; record qualitative SC class and treat classification as location-driven.

Differentiation & False Positives (Informative)

• vs. Edge sealant smear (R.01.02 / R.01.03): Sealant smears are on the face and removable/alterable by reveal; interlayer creep is within the stack and persists as an edge-internal phenomenon. Face-side smear, if present, should be separately classified under Residues.
• vs. A.02.01 Edge haze/whitening: Whitening is a diffuse optical change within the edge region of the interlayer; creep/exudation presents as material flow/exposure at the perimeter. Both are laminate-internal and generally CAT-5 by location.
• vs. A.02.06 Local delamination: Delamination shows ply/interlayer separation (air/void interface) rather than material ooze; look for edge “silvering”/void lines and parallax behaviors. Both are laminate-internal (CAT-5 by location).
• vs. Coating anomalies on the face (Co.01/Co.03): Coating rubs/patchiness are face-side appearance changes and are disallowed at acceptance on coated surfaces; interlayer creep is internal to the laminate.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique sweep with raking light; include at least one macro of the edge showing interlayer exposure/flow and one context frame showing overall perimeter continuity.
2. MSRT result (face): Record SC class on the face (expect SC-0); one pass only, non-marring; if a coating is present on the worked face, prefer polymer stylus or rely on visual/location cues.
3. Forms: Pane ID; product family + surface numbering (#1–#4; “laminate-internal” as needed); worked surface Y/N; functional coating on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.

Mis-ID Pitfalls (Informative)

• Attempting to “clean away” internal ooze on the face can smear a residue and create a new face-side film; classify any resulting film under R (Residues) separately from the internal condition.
• Do not abrade the face to “blend” an edge-internal cue; classification is appearance/location-only and acceptance pertains to the exposed face under VIS.

Reporting Language (Template)

A.02.04 Interlayer Creep / Exudation at Edge (Laminated) — Interlayer material is visibly exposed/flowing at the laminate edge; origin is laminate-internal (non-exposed). Face MSRT = SC-0. Observation persists after non-invasive reveal; classified CAT-5 by location/condition (out of in-place scope). Any incidental face residue from transfer has been recorded separately under R-series (if present). Documented with 12/36/72-in photo set, raking light, and surface numbering per VIS.

Definition (Reference)

A gradual color shift (amber/yellow/brown) occurring within the laminated interlayer (PVB/ionoplast, etc.) due to UV exposure, thermal load, or aging, observed between the plies. This is a laminate-internal appearance condition (not on an exposed worked face) and is generally not addressable in place; classification is location/condition-driven. Product/spec context for laminated glass is covered by ASTM C1172 and ISO 12543 (normative in VIS). Identify location using VIS surface numbering conventions; mark as laminate-internal (distinct from #1/#4 and IGU #2/#3).

Typical Presentation (Informative)

• Diffuse, non-sharp yellowing or browning, often more pronounced near edges/corners or behind opaque frits/spandrels where heat buildup occurs.
• Stable to cleaning and unchanged by Non-Invasive Reveal; no face-side transition edge or chip-flank cues.
• Visibility can increase with back-lighting or oblique viewing. (Apply VIS lighting/geometry.)

Field Identification Cues (Normative)

Location / access (primary):

• Confirm the phenomenon is laminate-internal (between plies). On forms, record product family (laminated) and surface numbering (#1–#4; tag as laminate-internal). This is not an exposed worked face.

Surface-catch class (MSRT):

• On exposed faces, record SC-0 (none). MSRT is single, non-marring and supports classification only; do not abrade. Prefer a polymer stylus on coated faces or rely on visual/location cues.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) before evaluation; persistent color shift after reveal supports internal origin. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• VIS geometry: 12 / 36 / 72 in, normal incidence + oblique sweep (~60°–120°) with raking light; add back-lit frames (when safe) to document color cast.

Classification Mapping (to VIS-DA) (Normative)*

• CAT-5 — Out of in-place scope when discoloration resides within the laminate (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).

Indicative Relief / Depth (Informative)

• Not a face-relief feature. On the exposed face, MSRT records SC-0 (no surface catch). Numeric μm depth ranges apply to face-side defects only.

Differentiation & False Positives (Informative)

• vs. External films/residues (R-family): Face films respond to Non-Invasive Reveal; interlayer yellowing does not.
• vs. Edge haze/whitening (A.02.01): Whitening is a milky diffuse edge effect; discoloration is a color cast (amber/brown) without a sharp boundary. Both are laminate-internal (CAT-5 by location).
• vs. Spandrel/back-paint mottle (Co.04): Spandrel anomalies are behind the glass coating system and often show pattern/mottle; interlayer yellowing follows laminate regions and lacks paint-system pinholes/holidays. (Use product context & surface numbering.)
• vs. Low-E color non-uniformity (Co.01.02): Coating color shift occurs on a functional coating surface (face-side; acceptance rules differ). Interlayer yellowing is between plies; classify by location.

Evidence Package (Documentation Requirements) (Normative)*

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include at least one back-lit image (when safe) to show internal color shift.
2. Forms: Pane ID; product family & surface numbering (#1–#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
3. Context notes: Orientation (cardinal), presence of frit/spandrel/film behind glass, proximity to heat sources; ambient temperature/RH at time of inspection.

Mis-ID Pitfalls (Informative)

Attempting face-side “correction” of a laminate-internal color shift may create an unwanted worked region (visible transition edge) disallowed by VIS acceptance for CAT-0…CAT-4. Keep classification appearance-only and location-based; refer rather than abrade.

Reporting Language (Template)

• A.02.05 Interlayer Discoloration/Yellowing (laminate-internal) — Diffuse amber/brown color shift between plies; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking (incl. back-lit frame). CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.

Definition (Reference)

Local delamination is a separation between a glass ply and the interlayer (or between interlayers) creating a void/air interface within the laminate stack. Presents as silvering, Newton-fringe iridescence, or a defined lens-like boundary inside the laminate. Because the cue is laminate-internal (between plies), it is not on an exposed worked face and is not addressable in place; classification is location/condition-driven. Product/spec context: ASTM C1172 and ISO 12543 (normative in VIS). Use VIS surface numbering and record as laminate-internal (distinct from #1/#4 and IGU #2/#3 faces).

Typical Presentation (Informative)

• Sharp, closed boundary (crescent/amoeboid) showing silvering or rainbow fringes under oblique/raking light; often edge-originating and creeping inward.
• May appear around cutouts/inserts, at corners, or where thermal/UV load and moisture are elevated.
• No change after Non-Invasive Reveal of exposed faces; no worked transition edge on the face. (Apply VIS inspection geometry.)

Field Identification Cues (Normative)

Location / access (primary):

• Confirm laminate-internal location. On forms, record product family (laminated) and surface numbering (#1–#4; tag as laminate-internal). Do not re-number laminate-internal interfaces as IGU faces.

Surface-catch class (MSRT):

• On exposed faces, record SC-0 (none). MSRT is single, non-marring and supports classification only—do not abrade to “probe” an internal cue. Prefer polymer stylus on coated faces or rely on visual/location cues.

Inspection environment / reveal controls:

• Perform Non-Invasive Reveal (clean & dry) before evaluation; persistence confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting:

• VIS geometry: 12 / 36 / 72 in; normal incidence + oblique sweep (~60°–120°) with raking light. Add back-lit frames (when safe) to capture fringes/silvering.

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 — Out of in-place scope when separation is within the laminate (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).
• If face-side damage also exists (e.g., perimeter scoring), classify that separately under the appropriate M-family item and assign CAT per VIS.

Indicative Relief / Depth (Informative)

• Not a face-relief feature. On the exposed face, MSRT records SC-0. Numeric μm ranges in VIS apply to face-side defects only.

Differentiation & False Positives (Informative)

• vs. Bubbles/stringers (A.02.02): Bubbles are discrete voids (round/linear) without pronounced fringe patterns; delamination shows defined separation boundary with silvering/iridescence.
• vs. Edge haze/whitening (A.02.01): Whitening is diffuse/milky; delamination has a sharp lens-like boundary and fringe effects.
  
• vs. Interlayer creep/exudation (A.02.04): Creep is material flow/exposure at the edge; delamination is ply/interlayer separation (air interface) within the stack.
• vs. IGU cavity anomalies (A.01 family): Cavity features sit on #2/#3 with fixed parallax between panes; delamination is within a laminate (record as laminate-internal). Use surface numbering to avoid cross-family mis-ID.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include at least one back-lit macro (when safe) to capture fringes/silvering and a context frame showing edge origin/extent.
2. Forms: Pane ID; product family & surface numbering (#1–#4; laminate-internal); worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist.
3. Progression note: If observed across site visits, record growth/creep of boundary (mm and date) and any environmental conditions (temperature/RH, sunload).

Mis-ID Pitfalls (Informative)

Attempting face-side “blending” to hide an internal boundary creates a worked region (visible transition edge) that VIS disallows at acceptance (CAT-0…CAT-4). Keep classification appearance-only and location-based; refer, do not abrade.

Reporting Language (Template)

• A.02.06 Local Delamination (laminate-internal) — Defined ply/interlayer separation with silvering/iridescent fringes inside the laminate; no change after Non-Invasive Reveal; MSRT = SC-0 on exposed faces; documented at 12/36/72 in with normal + oblique under raking (incl. back-lit macro). CAT-5 (laminate-internal; out of in-place scope). Refer per project protocol.

Definition (Reference)

Localized darkening/blackening that initiates at the perimeter of a silvered mirror and advances inward beneath the protective paint (back-coating). The phenomenon results from moisture/chemical ingress at edges or penetrations, leading to corrosion of the reflective metal layer. Appearance is behind the glass substrate (back side), not on the exposed viewing face. Classification/acceptance pertain to the exposed surface only under the VIS; back-side deterioration is handled by location/scope rules.

Typical Presentation (Informative)

• Perimeter “creep” band that is dark, brown-green, or black, often irregular or “map-edged,” growing inward from edges, cutouts, or scratched back-paint.
• Under-glass look: no change with front-face cleaning/reveal; no tactile relief on the viewing face.
• May be asymmetric (more severe at wet corners, splash zones, sinks).
• May show haloing around penetrations (mounts, clips) or at unsealed edges.

Field Identification Cues (Normative)

Surface-catch class (MSRT):

• On the exposed viewing face, record SC-0 (no relief). Perform one light, non-marring pass only; MSRT supports classification and must not abrade the surface. On suspected coated faces (front-surface functional coat over mirror glass), prefer a polymer stylus or rely on visual/location cues.

Reveal / lighting / geometry:

• Evaluate clean & dry after a Non-Invasive Reveal; use raking light and assess at 12 / 36 / 72 in at normal incidence and through an oblique sweep ~60°–120°. The back-side defect will not change with reveal and will remain visible by parallax/location cueing.

Location/access:

• Confirm the observation sits behind the glass (back-coating) rather than on the worked surface. Acceptance pertains only to the exposed surface under evaluation. Record pane ID and, where helpful, fixture/location context on Forms:

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 (Out of Scope for In-Place Restoration):
  If the cue is confirmed as back-coating corrosion (behind the glass), classify CAT-5 by location/condition and refer to replacement or mirror-fabrication remedies per project protocol. Surface catch on the viewing face is non-determinative; location controls.
• If any additional face-side damage (scratches, pits, coating anomalies) is present on the exposed surface, classify that face-side condition separately under the appropriate M/Co/Ch family by CAT; do not let the back-side condition drive face-side acceptance.

Indicative Depth / Relief (Informative)

Not applicable—deterioration occurs behind the viewing surface within the reflective/paint system. On the viewing face: SC-0 is expected; numeric depth for the back-side condition is not used for VIS classification/acceptance, which remain appearance-based on the exposed surface.

Differentiation & False Positives (Informative)

• vs. Front-face residues/films (R-series): Residues change with reveal and may show front-face MSRT cues; mirror blackening does not respond to reveal and remains under-glass.
• vs. Coating anomalies on the worked surface (Co-series): Coating rub/sheens occur on the exposed face and are disallowed at acceptance on coated surfaces; mirror edge blackening is behind the glass and is handled as CAT-5 location.
• vs. IGU between-pane defects: Fixed parallax within an IGU cavity indicates between-pane location; treat as CAT-5 similarly (out of in-place scope).

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS):
   • 12 / 36 / 72 in; normal + oblique; include raking frames.
   • One edge context frame showing the advancing black band from the perimeter or cutout; one macro confirming the cue sits behind the glass (unchanged by reveal; SC-0 on face).
2. MSRT result: Record SC-0 on the viewing face; one pass only; prefer polymer stylus if a front functional coat is suspected.
3. Forms: Pane ID; location; reveal status; lighting/time; geometry checklist; note “back-coating corrosion (behind glass)”; attach photos.

Mis-ID Pitfalls (Informative)

• Attempting to “polish out” what is actually behind the glass can create needless face-side worked regions with transition edges, which VIS disallows at acceptance. Keep classification appearance-only for the face unless genuine face-side damage exists.

Reporting Language (Template)

• A.03.01 — Mirror Edge Blackening (back-coating corrosion):
  “Dark/black under-glass band originating at the perimeter/cutout consistent with back-coating corrosion. Non-responsive to Non-Invasive Reveal; MSRT on viewing face = SC-0. Location/condition places the cue behind the exposed surface; classified CAT-5 (out of in-place scope) per VIS. No additional face-side damage observed at acceptance geometry (12/36/72 in; normal + oblique; raking light).”

Definition (Reference)

Discrete under-glass spots (darkening, brown/black dots, or small blooms) caused by localized corrosion of the reflective layer behind the glass where the protective back-paint/edge seal has been compromised (pinholes, scratches, clip pressure, moisture/chemical ingress). The phenomenon is behind the viewing surface (back-coating system), not on the exposed face. VIS acceptance pertains to the exposed face; back-side deterioration is handled by location/scope rules.

Typical Presentation (Informative)

• Peppered spots or small clusters radiating from edge/cutout/penetration zones or at back-paint scratches.
• Often map-edged or haloed; no change after Non-Invasive Reveal of the viewing face; no tactile relief on the face.
• May progress from faint amber to opaque black with time/continued exposure.

Field Identification Cues (Normative)

Surface-catch class (MSRT):

• On the exposed viewing face, record SC-0 (no relief). One light, non-marring pass only to support classification; do not abrade. Prefer a polymer stylus if a face functional coat is suspected.

Reveal / lighting / geometry:

• Evaluate clean & dry after Non-Invasive Reveal; use raking light at 12 / 36 / 72 in with normal incidence + oblique sweep (~60°–120°) per VIS. Back-side spots remain unchanged by reveal.

Location / access:

• Confirm the cue sits behind the glass (back-coating). Acceptance under VIS pertains to the exposed face only; back-side corrosion is classified by location/condition. Record pane ID and fixture/location context on Forms:

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 (Out of scope for in-place restoration): When confirmed as back-coating spot corrosion, classify CAT-5 by location/condition and refer to fabricator/replace per project protocol. Face MSRT is non-determinative; location controls.
• If separate face-side damage exists (scratches, films, coating rubs), classify that condition independently under M/Co/R families by CAT; do not let the back-side condition set face acceptance.

Indicative Relief / Depth (Informative)

Not applicable to the exposed face. The deterioration occurs behind the glass within the reflective/paint system. Expect SC-0 on the face; numeric depth is not used for back-side classification.

Differentiation & False Positives (Informative)

• vs. Front-face specks/overspray (R.02/R.06): Face residues respond to Non-Invasive Reveal and may show MSRT cues; back-side spots do not.
• vs. Mirror edge blackening (A.03.01): Edge blackening is a perimeter creep band; A.03.02 presents as isolated spots/clusters, often at back-paint scratches or clip points. Both are CAT-5 by location.
• vs. IGU between-pane artifacts: IGU cavity features show fixed parallax between panes (#2/#3); mirror corrosion is behind the substrate. Use product context and forms to avoid cross-family mis-ID.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include a macro showing spot edges/under-glass character and a context frame showing proximity to edges/cutouts/clip points.
2. MSRT result (face): SC-0; one pass; polymer stylus preferred if a face coat is present/suspected.
3. Forms: Pane ID; location; reveal status; lighting/time; geometry checklist; note “back-coating spot corrosion (behind glass)”; attach photos.

Mis-ID Pitfalls (Informative)

Attempting to “polish out” a behind-glass spot creates unnecessary worked regions (visible transition edges) on the face that VIS disallows at acceptance. Keep classification appearance-only for the face unless true face-side damage is present.

Reporting Language (Template)

• A.03.02 Spot Corrosion Behind Mirror (back-coating) — Discrete under-glass spots/cluster; unchanged after Non-Invasive Reveal; MSRT on face = SC-0. Location/condition places cue behind the exposed surface; classified CAT-5 (out of in-place scope) per VIS. Documented at 12/36/72 in with normal + oblique + raking; proximity to edge/cutout noted.

Definition (Reference)

Localized under-glass staining, bloom, or matting visible through the mirror that originates from adhesives, mounting compounds, cleaners, or chemicals acting on the back-coating/reflective layer (behind the glass). The cue is not on the exposed viewing face and therefore is not addressable in place; classification is location/condition-driven. Identify the product as a mirror/back-coated glass and apply VIS surface-numbering/context rules; acceptance under VIS pertains to the exposed surface only.

The Glass Restoration Standards…

Typical Presentation (Informative)

• Under-glass diffuse bloom (whitish/grey) or discolored patches behind the glass adjacent to adhesive points, clip/fastener locations, or at cleaner/solvent contact zones on the back.
• No change after Non-Invasive Reveal of the viewing face; no transition edge or chip-flank morphology on the face.
• May co-exist with edge blackening or spot corrosion elsewhere on the same lite (see A.03.01 / A.03.02 for related back-side phenomena).

Field Identification Cues (Normative)

Surface-catch class (MSRT):

• On the exposed viewing face, record SC-0 (none). Perform one light, non-marring pass only to support classification; do not abrade. If a face functional coating is present/suspected, prefer a polymer stylus or rely on visual/location cues.

Reveal / lighting / geometry:

• Evaluate clean & dry after a Non-Invasive Reveal; inspect at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°–120°) under raking light per VIS. Back-side attack remains unchanged by reveal.

Location / access:

• Confirm the observation sits behind the glass (back-coating) rather than on the worked face. On forms, record pane ID and product context; acceptance pertains to the exposed surface under evaluation. Use VIS surface-numbering on documentation where applicable.

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 — Out of in-place scope when the appearance change arises in the back-coating system (behind the glass). Document and refer per project protocol (fabricator/replace). Face-side MSRT and numeric depth are non-determinative; location controls.
• If any face-side condition is also present (scratches, films, coating rubs), classify that separately under M/Co/R families by CAT; do not let the back-side condition set face acceptance.

Indicative Relief / Depth (Informative)

Not applicable to the exposed face; deterioration occurs behind the glass. On the viewing face: SC-0 expected; numeric depth (µm) is not used for back-side classification.

Differentiation & False Positives (Informative)

• vs. Front-face residues/films (R-series): Face films respond to Non-Invasive Reveal; back-side attack does not.
• vs. Coating anomalies on the worked surface (Co-series): Coating rub/patchiness occurs on the exposed face and is disallowed at acceptance on coated surfaces; back-side attack is behind the glass (location-driven CAT-5).
• vs. IGU between-pane artifacts (A.01 family): IGU conditions show fixed parallax between #2/#3; mirror back-coating attack is behind a back-paint/reflective system, not a cavity condition. Use product context + documentation forms to avoid cross-family mis-ID.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, raking; include one macro confirming under-glass character (unchanged by reveal) and one context frame showing proximity to adhesive pads/clips/chemical exposure zones.
2. MSRT result (face): SC-0; one pass; non-marring; polymer stylus preferred when any face functional coat is present/suspected.
3. Forms: Pane ID; product & context (mirror/back-coated); reveal status; lighting/time; geometry checklist; surface numbering where applicable.

Mis-ID Pitfalls (Informative)

Attempting to “polish out” an under-glass cue creates unnecessary worked regions (visible transition edge) on the face that VIS disallows at acceptance (CAT-0…CAT-4). Keep classification appearance-only for the face unless true face-side damage exists.

Reporting Language (Template)

• A.03.03 Adhesive / Chemical Attack from Behind (mirror back-coating) — Diffuse bloom/discoloration behind the glass adjacent to adhesive/cleaner contact points; unchanged by Non-Invasive Reveal; MSRT on viewing face = SC-0. Location/condition places cue behind the exposed surface; classified CAT-5 (out of in-place scope) per VIS. Documented at 12/36/72 in with normal + oblique + raking; product context recorded.

Definition (Reference)

Discrete dark “black” spots, pin-voids, or small opaque islands occurring within the active switchable layer (e.g., PDLC or electrochromic stack) of a smart-glazing lite. Because the cue resides within the laminate or device stack (not on an exposed worked face), it is not addressable in place; classification is governed by location/condition under VIS rules. Use VIS surface numbering and parallax to confirm non-face location before assigning CAT.

Typical Presentation (Informative)

• Small, sharply defined dark points or voids that remain visible in both “on” and “off” states (contrast may vary with state).
• Often static in position; may be isolated or occur in small clusters; sometimes biased near busbars/lead areas or printed electrode edges.
• No change after Non-Invasive Reveal of exposed faces; no worked transition edge on the face when viewed under VIS inspection geometry.

Field Identification Cues (Normative)

Location / access (primary)

• Confirm the cue sits within the device/laminate and is not on a worked face. Demonstrate fixed parallax (feature remains fixed relative to its reflection as the observer moves). If between panes or internal to the laminate/device, classify CAT-5 by location. Record surface numbering on forms (#1–#4; tag laminate-internal when applicable).

Surface-catch class (MSRT)

• On exposed face(s), record SC-0 (none). The Manual Surface-Relief Test is a single, non-marring pass used only to support classification—not acceptance; it cannot “probe” an internal cue. Prefer a polymer stylus on suspected coated faces, or rely on visual/location cues.

Inspection environment / reveal controls

• Perform Non-Invasive Reveal (clean & dry) before evaluation; persistence confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting

• Apply VIS geometry: 12 / 36 / 72 in; view at normal incidence and through an oblique sweep (~60°–120°) with raking light. Use back-lit frames when safe to emphasize internal contrast.

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 — Out of in-place scope when the condition is laminate/device-internal (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).
• If any additional face-side damage exists (e.g., scratches, coating rub/patchiness), classify that separately under the appropriate family (M/Co/Ch) and assign CAT per VIS; do not let an internal cue drive face-side acceptance.

Indicative Relief / Depth (Informative)

• Not applicable on the exposed face(s): SC-0 is expected. Numeric μm ranges in VIS apply to face-side defects only; internal device/laminate anomalies have no measurable face-relief for MSRT.

Differentiation & False Positives (Informative)

• vs. Coating anomalies on the worked surface (Co-family): Coating rub/sheens occur on the exposed face and are disallowed at acceptance on coated surfaces (VIS §6.2.e). Internal active-layer voids show fixed parallax and remain unaffected by reveal.
• vs. Between-pane particulate (A.01.03): Cavity fines present on #2/#3 faces and may look speckled; verify location with parallax and surface numbering; both are CAT-5 by location, but family assignment differs.
• vs. Face-side residues/films (R-family): Residues change with reveal and can show face-side MSRT cues; internal active-layer voids do not.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in; normal + oblique; include raking frames and a short sequence (or paired frames) demonstrating fixed parallax. Note lighting/time and reveal status.
2. Forms: Pane ID; product family (smart glazing—PDLC/EC); surface numbering (#1–#4; laminate-internal if applicable); “worked surface Y/N”; functional coating present on worked surface? (Y/N/Unknown); environment checks (dry; no condensation).
3. Acceptance split: Internal device/laminate conditions are not subject to in-place acceptance under VIS; document and refer. Do not conflate factory/system issues with VIS acceptance for restored faces.

Reporting Language (Template)

A.04.01 Black Spots/Voids in Active Layer (PDLC/EC) — Discrete internal dark points verified by fixed parallax; no change after Non-Invasive Reveal of #1/#4; MSRT records SC-0 on exposed face(s). Logged as CAT-5 (out of in-place scope by location). Documented per VIS (photos at 12/36/72 in; normal + oblique + raking; surface numbering recorded) and referred to manufacturer/warranty per project protocol.

Definition (Reference)

Visible anomalies associated with busbars, printed/laminated leads, or current-distribution traces within a switchable glazing device (e.g., PDLC or electrochromic). Typical cues include misalignment/print-through, discontinuities, smears, voids, corrosion/discoloration along the busbar edge, or local opacity near conductors. Because the condition resides within the laminate/device stack—not on an exposed worked face—it is not addressable in place; classification is governed by location/condition. Use VIS surface numbering and parallax to confirm non-face location.

Typical Presentation (Informative)

• Straight or gently arcing conductor bars/traces visible at a margin or behind a ceramic print, with local dark bands, patchy opacity, or color shift adjacent to the busbar/lead.
• Print-through of conductive ink or a smeared edge where the trace transitions into the active area.
• Localized voids or thin spots in the active layer adjacent to the busbar (contrast varies between ON/OFF states).
• No change after Non-Invasive Reveal of the exposed faces; no worked transition edge on the face.

Field Identification Cues (Normative)

Location / access (primary)

• Confirm the cue sits within the device/laminate (not on #1/#4). Demonstrate fixed parallax to distinguish internal/device features from face-side conditions. Record surface numbering (#1–#4; note laminate-internal when applicable). When internal, classification is CAT-5 by location.

Surface-catch class (MSRT)

• On exposed face(s), record SC-0 (none). The Manual Surface-Relief Test is a single, non-marring pass used only to support classification—not acceptance. Prefer a polymer stylus on suspected coated faces, or rely on visual/location cues.

Inspection environment / reveal controls

• Complete a Non-Invasive Reveal (clean & dry) before evaluation; persistence of the cue confirms non-face location. Avoid blades/abrasives/chemicals prior to classification.

Viewing / lighting

• Apply VIS geometry: 12 / 36 / 72 in; normal incidence and oblique sweep (~60°–120°) with raking light. Add back-lit frames when safe to emphasize internal contrast.

Classification Mapping (to VIS-DA) (Normative)

• CAT-5 — Out of in-place scope when the anomaly is internal to the switchable device/laminate (not on an exposed worked surface). Document and refer per project protocol (fabricator/manufacturer/warranty).
• If separate face-side damage exists (scratches, coating rub/patchiness), classify that independently under the appropriate family (M/Co/Ch) by CAT; do not let an internal cue control face-side acceptance.

Indicative Relief / Depth (Informative)

Not applicable on the exposed face(s): SC-0 expected. Numeric μm ranges in VIS apply to face-side defects only; internal device/laminate cues have no measurable face relief for MSRT.

Differentiation & False Positives (Informative)

• vs. Coating anomalies on the worked surface (Co-family): Coating rub/patchiness is on the exposed face and is disallowed at acceptance on coated surfaces; busbar/lead anomalies are internal and show fixed parallax.
• vs. Between-pane particulate (A.01.03) or spacer smear (A.01.04): Cavity artifacts sit on #2/#3 faces; device traces are laminate/device-internal. Use parallax + surface numbering to separate. Both internal conditions map to CAT-5 by location.
• vs. Face-side residues/films (R-family): Residues respond to Non-Invasive Reveal and can show face-side MSRT cues; busbar/lead issues do not.

Evidence Package (Documentation Requirements) (Normative)

1. Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking. Add one short sequence (or paired frames) demonstrating fixed parallax relative to reflections. Note reveal status and lighting/time.
2. Forms (VIS Appendix X3 fields): Pane ID; product family (smart glazing—PDLC/EC); surface numbering (#1–#4; laminate-internal if applicable); worked surface Y/N; functional coating on worked surface? (Y/N/Unknown); reveal status; geometry checklist.
3. Acceptance split: Internal device/laminate conditions are not subject to in-place acceptance under VIS; document and refer per project protocol.

Mis-ID Pitfalls (Informative)

Attempting to “polish out” a device-internal cue risks creating a face-side worked region with a visible transition edge, which VIS disallows at acceptance (CAT-0…CAT-4). Confirm reveal status and parallax/location before any action.

Reporting Language (Template)

• A.04.02 Busbar/Lead Defects Visible Through Lite (PDLC/EC) — Internal conductor/edge anomaly verified by fixed parallax; no change after Non-Invasive Reveal; MSRT on exposed face(s) = SC-0. Location/condition places cue within device/laminate; classified CAT-5 (out of in-place scope) per VIS. Documented at 12/36/72 in with normal + oblique + raking; surface numbering recorded; referred to manufacturer/warranty.