Quote Originally Posted by Rudeofus View Post
There are methods for getting rid of MnO2 stain, while Ag2S is almost impossible to remove. Tiny Silver crystals can be bleached away with C41/E6 bleach (which won't touch Ag2S). This would give you some indication what kind of stain you got. Needless to state that you only need to check for MnO2 right after the bleach step.
Rudeofus. Sorry to be dim but I don't know how to check for MnO2 stain after the bleach stage. After the bleach and clearing stage the remaining positive image is always a milky light yellow-green until it has been developed. Or is that what you mean? There are no images that capture this stage in the process to refer to, that i have seen. But I found this one from when I was using a makeshift reel and taken during re-exposure: