RE: Crystal reflections: why a dark patch is not a coating test · RWI-28258

Reader check for “Crystal reflections: why a dark patch is not a coating test”: distinguish the discussion point “Compare multiple controlled angles and describe the visible observation without asserting…” from its proposed application. The thread offers a way to reason about the question, without adding a personal experience or a newly observed outcome. Review focus: scope. Keep the stated question separate from any broader claim.