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Short answer: I don't really know - and I don't care.
Meaning I hardly ever ever enlarge anything from color negatives the traditional way in this day and age - I get stuff developed at a proper lab, and then I scan the negs and go from there.
It's sad - but I don't have access to a colour lab, and to be honest I'm not great at enlarging colour (and having it done properly by somebody else has gotten unbelievably expensive where I live).Apart from this I can only cite the Cinestill FAQ -
Q: What is the shelf-life & archivability of CineStill Film processed in C-41 chemistry?
A: (...) C-41 process uses some of the most archival chemicals available for photo processing today. There have been no scientific tests for the dye stability of ECN film cross-processed in C-41 but from our tests on film processed four years ago there is no color degradation or fogging of the magenta dye layer.I'm not sure what "similar venture in the past" you have heard of; might be good to know that (also quoted from CineStill's FAQ -)
It is important to note that CineSill is NOT "repackaged" motion picture film. Rather, we utilize the same advanced emulsion technology found in Motion Picture film to create a still photography film which is made for C-41 processing. (...)
"Repackaged" motion picture film CAN NOT be processed in standard C-41 film processors due to the Remjet backing present on motion picture films, which would contaminate the chemistry and damage both the machine and film inside.Companies which "repackaged" old unused motion picture stocks forced the photographer to send the film back to them for makeshift motion lab processing
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salad
@Ghibli
A question to tina.kino: I've read elsewhere some concerns regarding the long term colour stability of Cinestill negatives; and as a reference was cited a similar venture in the past (conversion of movie film and and using different processing). Considering your knowledge and experience I decided to ask you what do you think about that?