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#1
02-05-2019, 02:40 PM
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I have seen Topps with glosscoat that yellows back into the late 70's. Some are cards I got in packs at the time that have been stored with cards also bought in packs that didn't yellow. (As well as varying degrees of gloss, which I should study at some point, but studying something that's mostly clear isn't easy)
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#2
02-06-2019, 07:35 AM
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Not a chemist but the yellowing may be due to chemical reactions over time between the cards and the plastic types of graded holders, sleeves and top loaders, not to mention pages...cards in the box may stay white because there is nothing to react to...
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