Hi Ellen,(posted 9437 days ago)as you state in your question, it's meant to be developed in c41. If sent away to "proper black and white development", i.e. put in Tmax developer or some other non-c41 chemicals, the film will be ruined. Since the CN hasn't been around for more than one year we don't know yet how long it will last. But we know it can produce beatiful prints on black and white fibre paper and those prints can last for perhaps 100 years properly developed, fixed and toned. So your insurance for archival stability would be prints on baryta paper!
I like the film, it is really nice in the 120-format. I stopped using it anyway because it is so much cheaper to develop regular b&w film in Xtol at home.