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RE: [Demo notebook] Reference notebook: corrections and recurring beginner questions · RWI-12476

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#98290
TimingNotes 05149
Participant

Case 15 — Crystal reflections: why a dark patch is not a coating test

A dark area appears at an oblique angle in a single photograph. Does that establish a coating difference?

Exercise RWI-12476/15: address this question within its stated limits.