I have some old film cans which are marked as 'exposed' and 'CR50'. From what I can tell, this is most likely to be Ferrania CR50, but that's an assumption.
I've done a fair bit of B&W developing (mostly of 16mm cine film), and having read about developing colour reversal film as B&W I decided to give it a go - using Ilfosol S, Ilfostop & Ilfofix just as I've done with some old FP4 cine film.
The result on the first CR50 film was disappointing - nothing on there. I can make out a slight darkness change between the film that was inside the can and the small amount poking out the end of the can that was exposed to light - so I guess I've 'developed' something.
But can anyone tell me a better way to develop this (as colour, or B&W). I can't seem to find any reference to what process it needs.
---- UPDATE ----
My film scanner found nothing on the film - and even I was pushed to see anything other than possible 'smudges'.
Then I looked again at the top edges with a magnifying glass, and I can see, quite faintly, 'SAFETY' in a few places. So, it does appear to have developed - but perhaps the original pictures were very underexposed as there's really nothing to see.
I'll increase the developer concentration and temperature for the next can (I have 4 more). It's good to know I'm on the right track and the comments below reassured me enough to look again at the film.