Ilfochrome materials are much too expensive to play with for experimentation. You have to get it right quickly or you are into a lot of waste paper. The dye bleach process is just as prone to variations in balance and having crossover as any other color process, but has the additional burden of using a lot of acid.

Well, that and the fact that KI is not all that nice at that pH either.

I have lists of possible dye bleach formulas and catalysts here from our R&D on it at EK.