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RE: [Demo notebook] Reference notebook: corrections and recurring beginner questions · RWI-10500

#83616
MovementIndex 00475
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Case 47 — 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-10500/47: address this question within its stated limits.