RE: Vintage Photos - Lot 3 (505-508)
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You're right in that Kodachrome was the most stable and typically have the least amount of color fading. I'm not actually sure what this set was. Possibly Ektachrome.
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I see, well its coded outside of the image area, would guess (almost?) all Ectachrome produced has that printed?
Kodachrome is a very complicated, totally different process where each layer for the colours ends up being composed of a dyed compound only, so no silver, no fading.
Remember following efforts that people did to be able to keep it going, but ultimately it was actually impossible, at least in practical terms.