Its been a long time, but I seem to remember a lot of the stained cards I experienced were wax. Newer cards fresh out of the pack might have been affected by the gum sometimes, I don't recall, but I have seen some really old packs and the gum staining is nasty, sometimes even so bad the gum won't even come off the card. I assume that is from the ingredients in the gum breaking down over time.
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Looking for: Unique Steve Garvey items, select Dodgers Postcards & Team Issue photos
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