DSS-P.02.03 — Stones / Knots (solid inclusions)

Stones/knots are solid inclusions within the glass body (e.g., unmelted batch, refractory fragments) produced during glass manufacture. When fully encapsulated, they are manufacturing features (optical/appearance effects) rather than surface-relief defects. Evaluate with VIS lighting/geometry for consistency; product/factory acceptance is distinct from VIS post-restoration acceptance.

• Discrete, non-gas inclusion often visible as a speck or tiny body with slight lensing/shadow; location appears stable under parallax (moves with the glass, not with the surface reflection).
• Pane-wide cleaning (Non-Invasive Reveal) does not change visibility; no wipe-responsive residue film.
• If the inclusion breaks the surface (rare), the site presents as a pit/crater with possible chip flanks in raking light.

Surface-catch class (MSRT):

• Encapsulated stone/knott: SC-0 (none) - one light, non-marring pass finds no tactile relief (feature is subsurface). Do not abrade or repeat passes.
• Open (surface-breaking) stone: reads as local pit/crater; expect SC-1/SC-2 depending on depth/edge condition (see CAT-3/4 cues).

Morphology / visual signature:

• Encapsulated: no transition edge, no chip flanks, no local modeled micro-texture; discrete point feature.
• Open: pit/crater possibly with bright flanks in raking light; may be visible at standard/wide-field views if severe.

Viewing/lighting (use VIS): Inspect at 12 / 36 / 72 in, normal and oblique sweep (~60°-120°) under raking light; surfaces must be clean/dry.

Location/access: Record surface numbering (#1-#4; laminate-internal). If a similar cue is confirmed between panes (fixed parallax), record CAT-5 (out of in-place scope by location).

• Encapsulated stone/knott (non-relief): Processing Feature - Not Surface Damage (outside CAT-1...CAT-4); document only.
• Open (surface-breaking) stone: classify by observable morphology + surface-catch: often CAT-3 (clear catch; modeled texture/lines nearby) or CAT-4 if rough chip flanks/pits are prominent at standard/wide-field views.
• Between-pane/inaccessible look-alike: CAT-5 by location/condition; refer per project protocol.

• Encapsulated: no measurable surface relief at the exposed surface (SC-0).
• Open: relief varies; field classification relies on catch + morphology (pit/crater; chip flanks), not numeric depth.

• vs. Seeds/Blisters (P.02.02): Seeds are gas inclusions; when open, present as craters but often with smoother edges; encapsulated seeds also read SC-0. Stones are solid and more likely to have irregular boundaries if open. (Use MSRT + raking.)
• vs. Hot-particle peppering (Th.01): Thermal pits show bright chip flanks and often occur in clusters/fields; classify per CAT-3/4 morphology if present.
• vs. Metallic/paint specks (Residues/Overspray): Residues change with Non-Invasive Reveal; true inclusions do not.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; include raking usage; where practical, capture a straight-line reflection to show absence of a worked perimeter.
• MSRT result: Encapsulated → SC-0; Open → SC-1/SC-2 (record). One pass only; non-marring.
• Forms: Pane ID; surface numbering; worked surface Y/N; coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time.
• Acceptance split: VIS governs post-restoration appearance; factory inclusion quality is governed by product standards/project specs-do not conflate.

Local “spot-work” on an encapsulated stone can create a worked region with a transition edge, which VIS disallows at acceptance (CAT-0...CAT-4). Keep classification appearance-only unless a surface-breaking pit is confirmed.

• P.02.03 Stones/Knots (Processing Feature) - Discrete solid inclusion observed at VIS geometry; MSRT = SC-0 (no surface relief). No transition edge or fracture morphology. Recorded as manufacturing inclusion; not categorized as surface damage under VIS-DA. If surface-breaking, classify by CAT-3/4 morphology; if between panes, record CAT-5 and refer per project protocol.