RE: [Demo notebook] QC clinic: photographic evidence and its limits · RWI-19961

Case 18 — Crystal reflections: why a dark patch is not a coating test

Clarification for “Crystal reflections: why a dark patch is not a coating test”: the point beginning “No single lighting setup settles…” 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: scope. Keep the stated question separate from any broader claim.