Photographic stuff after roughly 1982-83 should be ok. Kodak made a change beginning in 1981 and was comitted to it by 1982.
On motion picture film it's labeled LPP, with a previous version being labeled SP. SP fades less than the older stocks, turning a bit brownish. LPP is pretty much ok. The earliest bits are showing some loss of density, but will likely be good for a long time. I'm not sure if those labelings carry over to still films or large format commercial films/papers.
Anything B+W or marked Kodachrome will be ok for a very long time, As will dye transfer prints - Technicolor for motion picture stuff probably unmarked for anything else but it's almost a "you'll know it when you see it" thing. Brilliant colors and no fading even at 70 years or more. (Technicolor labs also processed regular Kodak film, so the name on a can doesn't mean it's a dye transfer print)
Steve B
Steve B
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