DSS-M.01.01 — Scraper/Razor Scoring

Linear score(s) produced by blades/scrapers/razors or sharp edges contacting the glass face, typically presenting bright “chip flanks”/micro-chipping along the line in raking light. Distinct from coating anomalies (area sheen/colour change) and from non-directional residue films. Terminology for micro-chipping and chip flank follows VIS §3; classification is appearance-based using surface-catch and morphology under VIS viewing conditions.

• One or more straight or gently arced lines; often directional with sparkling edges in raking light due to chip flanks.
• Persists after Non-Invasive Reveal (clean & dry); unlike residue, the cue does not wipe off.
• Can occur as single tracks, clustered short scores, or parallel passes (e.g., blade at a guide).

Surface-catch class (MSRT)

• SC-2 (clear) is common for true blade scores; shallow grazes may read SC-1 (slight). Perform one light, non-marring pass only; MSRT supports classification, not acceptance.

Reveal / lighting / geometry

• Complete Non-Invasive Reveal (distilled/neutral-pH water, lint-free microfiber; no blades/abrasives/chemicals before evaluation). Inspect at 12 / 36 / 72 in, normal incidence + oblique sweep (~60°-120°) under raking light.

Location / access

• Confirm the cue is on the exposed face (not between panes). If any doubt, use parallax (between-pane features show fixed parallax) and record surface numbering #1-#4.

• CAT-2 - Light: Narrow, fine-edged lines with SC-1, no pronounced chip flanks; limited impact at standard view.
• CAT-3 - Moderate: SC-2 with minor chip flanks; line(s) noticeable at standard distance.
• CAT-4 - Severe: SC-2 (clear-to-strong); rough chip flanks, possible pits/craters; distinctly visible at standard and wide-field views. (Use VIS visibility convention and MSRT outcome; “linear directionality with chip flanks suggests mechanical history.”)

• CAT-2: ~0.2-1 μm typical surface incision (clean edges; no pronounced flanks).
• CAT-3: ~1-5 μm with incipient micro-chipping along flanks.
• CAT-4: ≥5 μm with rough chip-flank breakout; local pits/craters may be present.

(Depths are illustrative for cueing only; VIS classification/acceptance remains appearance-based.)

• vs. Coating anomalies (Co-family): Coating rub/patch/colour shift is area-based, SC-0/SC-1, and lacks chip flanks; worked-surface coating anomalies are not permitted at acceptance.
• vs. Residue films/overspray (R-family): Residues change with reveal; a true score persists.
• vs. Glass-on-glass tracks (M.01.03): Tracks often appear as paired arcs/lines with alternating intensity; confirm chip flanks for scraper scoring.
• vs. Between-pane features (A-family): Internal cues show fixed parallax → CAT-5 by location.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking; add macro frames of the line showing chip flanks without a worked transition edge. Note reveal status and lighting/time.
• MSRT result: Record SC class (often SC-2); one pass, non-marring.
• Forms: Pane ID; surface numbering; worked surface Y/N; geometry checklist; photos attached (per VIS Appendix X3 fields).

• Attempting to “feather” a score during inspection can create a worked region/transition edge, which VIS disallows at acceptance for CAT-0...CAT-4. Keep evaluation non-marring and appearance-only.

• M.01.01 Scraper/Razor Scoring - Linear line(s) at #__ with chip-flank sparkle in raking; MSRT = SC-2 (clear). Persists after Non-Invasive Reveal. Classified CAT-2/3/4 by visibility and flank severity per VIS. Photo set at 12/36/72 in (normal + oblique + raking); surface numbering and form fields recorded. Acceptance per VIS §6 (appearance-based).