Run into these on a regular basis; they tend to be either pink or blue.
Decided it was time I asked in case anyone knew.
Not sure which is flotsam and which is jetsam … does anyone know?
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Sometimes it's woth trying to set things alight and noting its behaviour. If it burns into ash it's of plant origen. If it melts into a little ball and smokes excessively it's synthetic. If it smells sulphury it's animal. If it yells " ouch! " its alive.
PS: Remove slide from stage before applying flame.