I think it’s just age. I bought several cards this past weekend from a dealer that had a box of cards with toploaders as you’re describing. The cards were fine, but I placed them all in new toploaders when I got home.
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Originally Posted by judsonhamlin
Maybe a change in the manufacturing process? My newer holders also don't have the tinting issue.
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That is possible too. Perhaps it was the chemicals in the plastic at that time – kind of like the Rawlings baseballs that were yellowing prematurely a few years ago. I heard the cause of that was a chemical in the glue and they changed glues. I don’t know if that was true or not, but their baseballs sure seem to stay white now (or at least that’s been my experience).