airfrogusmc
Veteran
1945, I don’t know, seems to me to have held up pretty well. Probably better than an Ektachrome from 1965.
Absolutely. In film days Kodachrome was the only color process considered to be archival. Just look at how well some of these 50+ year old images have held up? I do believe the reason is the K process where the dyes are added not part of the film as in E6. Dyes are for the most part vegetable dies so they will deteriorate over time.
Kodachrome professional was what was called at the time ripened so it was refrigerated and if you shot it right away and had it processed right away and kept it refrigerated when not being in camera the color should be consistent between rolls with the same batch #.
The non pro Kodachrome had an estimated shelf life where the film was estimated to rippen when the photographer shot the film and took in the entire in the store on the shelf, bought and processed part as all in the which may but usually was not actually right. Close enough for most though.