We have been cleaning up after yet another Hurricane and my wife was putting back outside a mirror (designer type in frame) outside. So the better we might look around a corner...
The mirror had a mark in the metal area - and it was mentioned in passing. I figured the typical blackened mirror from a scratch...
Wrong! - The break in the rear surface (protection layer) was small but in several areas. A long complex fuzzy deep brick RED (not black as in silver oxide) upon examination, I discovered it to be
A hasmat item.
Martin