Balda 6x6 Folders - Info Please

Fungi? Thanks for the tip.

It's a mix of dried sweat, skin oils, actual sloughed off skin cells, and fungi! It's what happens when fingerprints run amok. A DNA lab would have a field day with that. Most vintage cameras have that to some extent, but... well ... whoever owned that originally must not have washed his hands much.
 
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