Patrick, Assume the film is 320TXP, here are a few questions...
1) If I don't prewash (not just pre-wet) the film, the metol-c dev turns deep, dark blue-purple. Can I re-use it?

2) why is D-23 (for example) almost clear after developing even multiple sheets of film (TXP) while the metol-C developer contemplated here is not? Where does the color go with D-23?