OT(ish) - Top Loader Question
I keep my ungraded pre-war in top loaders and (mostly) in penny sleeves. When I recently looked at my '39 Playball set, I noticed that many of the holders had turned golden in color. What is the cause of the discoloration and does it impact the card? There didn't seem to be any damage to those cards that aren't in sleeves.
Judson
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