Quote Originally Posted by Photo Engineer View Post
It could have been a form of bromide/iodide drag or transfer. But those negatives must have been in close contact!

They were. One pair out of a stack of 6 or 7 sheets, were emulsion to emulsion because I flipped one sheet over. Sure I shuffled the sheets, but the pair stayed together the entire time in developer.

Could have been bromide/iodide... Is that what Todd-Zakia mean by "reaction products"?