DSS-P.02.01 — Tin-Side Haze / Surface “Side” Effects

Subtle appearance differences between float-glass surfaces-commonly a faint haze/iridescence or slightly different “sheen” on the tin-side versus the air-side-arising from normal float manufacture. These are factory surface-side signatures, not field-induced surface-relief defects. Observe with VIS lighting and viewing geometry for consistency; product acceptance for factory surfaces is separate from post-restoration acceptance under VIS.

• Very low-contrast haze or color cast that is pane-wide or area-wide rather than localized.
• Can be more evident at oblique sweep and under raking light; often disappears or diminishes at other angles.
• No ring/boundary and no response to Non-Invasive Reveal (clean/dry).

Surface-catch class (MSRT): SC-0 (none). Perform one light, non-marring pass per VIS §5.5; do not abrade or repeat passes. Tin-side haze is an appearance-side effect, not local relief.

Visual signature: Uniform, non-directional variation in tone/shine; lacks directional patterning and transition edge.

Viewing/lighting: Inspect at 12 / 36 / 72 in with normal incidence and oblique sweep (~60°-120°) under raking light.

Location/access: Pertains to the exposed surface under evaluation; record surface numbering (#1-#4 / laminate-internal) when IGUs/laminates are present.

• Not field damage. If observation confirms SC-0 with pane-scale, non-directional side effect and no local morphology, record: “Processing Feature - Not Surface Damage (outside CAT-1...CAT-4).”
• If a look-alike cue is confirmed between panes (fixed parallax in an IGU) or otherwise inaccessible, classify as CAT-5 (out of in-place scope) by location/condition.

Not applicable as a local relief quantity. Tin-side/air-side differences are appearance-side phenomena of float manufacture; no micrometre-scale relief is detected by MSRT (SC-0).

• vs. Micro-abrasion swirls (M.02.01): Abrasion presents directional or curvilinear texture and may read slight catch; tin-side haze is non-directional and SC-0.
• vs. Coating anomaly on worked surface (Co.01/Co.03): Coating rub/patchiness is localized and constrained by a worked boundary; VIS acceptance prohibits visible coating anomalies on the worked surface.
• vs. Chemical micro-etch (Ch.03.03): Chemical etch exhibits modeled micro-texture and may escalate to slight/clear catch as severity increases; tin-side haze remains SC-0 and lacks modeled texture/rings.

• Photo set (VIS): Capture at 12 / 36 / 72 in, normal + oblique; include raking usage in notes; avoid filters that alter appearance.
• MSRT result: Record SC-0; 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; inspection geometry.
• Acceptance split: VIS governs post-restoration acceptance; factory side-effects are addressed by product standards/project specs. Do not conflate.

• Attempting localized “correction” of a factory side effect can create a worked region with a transition edge, which VIS disallows at acceptance for CAT-0...CAT-4.

• P.02.01 Tin-side haze / surface side effect (Processing Feature) - Pane-scale, non-directional appearance difference consistent with float surface-side signature; MSRT = SC-0 (no surface relief). No transition edge or chip-flank morphology. Recorded as manufacturing surface-side feature; not categorized as surface damage under VIS-DA. If fixed parallax indicates cavity location, record CAT-5 and refer per project protocol.