Pablito
coco frío
Guessing what a "digital pigment print" (whatever that is) will be like in 60yrs is pure conjecture (bullshiet).
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Well, if you don't know what it is, you can google it, no need to guess. Or as we might have said in the days of Kodachrome, "look it up."
And while we don't know what anything will be like in 60 yrs, there is a good body of scientific knowledge about the permanency of certain pigments, papers, etc. You may wish to google "pigments."