RE: [Demo notebook] Reference notebook: corrections and recurring beginner questions · RWI-11192

Case 39 — Crystal reflections: why a dark patch is not a coating test · source wording exercise

Clarification for “Crystal reflections: why a dark patch is not a coating test”: the point beginning “Compare multiple controlled angles and describe the visible observation without asserting…” belongs to the question as written. It should not be read as a report that a new check, purchase or experiment has been completed. Review focus: source wording. Retain the source wording beside any paraphrase.