I agree with Bob. You can test out some different ASAs on a single roll pretty efficiently. I use Fuji Provia at box speed and cross process myself on a Jobo using Rollei C41 chemistry (rumored to be Fuji). I haven't tried Kodak transparency film but I heard it's more contrasty than Fuji. Also worth mentioning, the negs come out grainier as a result of the cross process. So, bigger negs would be better to shoot than say 135. I do my cross processing at the end of my color development runs as the transparency film appears to contaminate the chemistry--or at least I wouldn't want to run regular color negs after cross processing. I hear labs often charge more for cross processing as they run it at the end of their development sessions to minimize the effects of whatever comes off the transparency film. I'm likely a rarity these days, but I make c-prints in an analog darkroom (Saunders 4x5 enlargers printing to Fujimoto CP-31 processor). I find I need to remove most magenta from prints and sometimes have to engage the cyan filter to get the colors into the realm of plausibility. That said, as with Bob, the whole point for me with cross processing is using it as a method for abstracting images. Attached a recent sample I just shot in June--actually a scan of a c-print (Fuji Type-CN paper).
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