RE: [Demo notebook] Collector’s comparison desk: dimensions, fit and documented differences · RWI-28278
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Case 53 — Crystal reflections: why a dark patch is not a coating test · source wording exercise
A dark area appears at an oblique angle in a single photograph. Does that establish a coating difference?
Review focus: source wording. Retain the source wording beside any paraphrase. Use the original answer fragment “Compare multiple controlled angles and describe the visible observation without asserting…” as the discussion anchor; no new event or result is supplied.
Exercise RWI-28278/53: address this question within its stated limits.