Hi, I was hoping to get some input on the films with the longest lifespan. After re-entering film photography, I focused on the cheapest film (Kodacolor/Colorplus 200), and inexpensive processing. I have since decided that I want my negatives to last. I researched the longest lasting color films, namely Kodachrome, the Fujichromes, Ektachromes, and Agfachromes for dye stability. This is interesting for color dye stability, but another issue is vinegaring. This seems to happen to all acetate-based films. Agfa RSX 200 is the only still film I know of that uses polyester, an indestructible base it would seem.
Is there a difference between acetate and triacetate ? I have found that nearly all of the still films today are triacetate, with Kodak Ektar being an acetate, and Agfachrome being polyester.
I would like to know your thoughts, because I have a lot of Kodachromes from the 1960s that have held up, so whatever that base is seems very good. I don't know much about C-41 longevity, but I would like to know if you've had any experience with a very stable C-41 film or how to prevent vinegaring.
Thank you in advance.