Color film and photo paper is made with dyes that fade and shift over time. An inkjet print with pigments will last longer. Only monochrome silver metal film or paper will last indefinitely, and it's the gelatin layer that will last, some substrates including consumer-grade acetate film and most papers will degrade. The best archival format is silver on polyester film. Color can still be achieved by way of three exposures in RGB, similar to Technicolor.
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