I bought a roll of Eastman Double-X Negative Film 5222 from the Film Photography Podcast filmphotographyproject.com/ to try out. This is black & white film used to make motion pictures. They buy it in large rolls and respool on 100 foot rolls and in 35mm canisters for resale.
Below are few frames from the roll. It was developed in my usual Caffenol-C-L for 30 minutes semi stand. I like the tones of the film, but, it has a lot of grain for ASA 200 film. Caffenol may not be the best developer for it.