Nobody's explained how rodinal doesn't produce a brown image when used normally but only in reversal--what is the mechanism? it seem to me that there's nothing added in the silver that is causing a different chemical reaction. An ingredient was identified, but it was not explained as to how it only would affect the second development. So that appears to be nothing more than speculation...also--the subject is removing it--is it impossible to remove? There's a way to do everything.