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Julie Vognar...what about keeping cards in the dark? And photos? Always thought you were supposed to. At the Asian Art Museum, Asian color or ink on paper or silk can only be up (in rather dim light) for a few months; then they have to go back into storage for a couple of years. Humidity also very important. Laquored stuff has to be almost wet, and fabric as dry as possible...
Now I'm not saying a baseball card is a Chinese masterpiece, but I know they also fade, tone, and change... as for photographs, look at your grandmother's photograph album, and see what's left!