As I knows there are two differnrt film bases: Acetate and ???

Film base can aslo dictate how long the neg will survive....

Can anyone say more about kind of film bases found in 35mm, roll film, and 4x5" film.

I am interseted to learn kinds in current productrion and what differnce they make. Particularly I would like to learn more aboult Ilford and (former) Agfa APX films.

Thanks for your time

Daniel OB