Synthetic demo • AI-assisted. Fictional discussion exercise with simulated dates. No real purchase, customer review, patient, expert identity or experimental result is represented.
A dark area appears at an oblique angle in a single photograph. Does that establish a coating difference? This is an explicitly synthetic discussion case for reviewing evidence and documenting uncertainty; it does not describe a real purchase, patient or experiment.
Question record — WATCH-21634| Subject | Crystal reflections: why a dark patch is not a coating test |
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| Scope | The stated question; sources, interpretations and unresolved points. |