This doesn't come up often I'm sure but I had a question recently about developing color film in black and white chemistry. Since then I have done it and find it very doable in my current methodology. The time for the developer is very similar to a simple black and white film. The fixer might take a little longer I'm not real sure yet. The fixer I used was cold as a corpse. I scanned mine immediately upon drying so I have no further use for the negative at the moment. I have no idea how it will keep, but I have boxes of them that I never reuse anyway. Since I scan the negatives and zero out the base color anyway, it is a very doable project. I think I have found a universal film since the 46mm is currently pretty inexpensive. I expect that it can be successfully rolled into a used 120 paper paper and shot as a 4x6 negative. Just requires a little imagination i think. Then develop it either way, color or black and white.