Quote:
Originally Posted by JollyElm
We talked about it regarding the cracking and bending of Kellogg's 3-D cards and I'm thinking this may be the culprit here as well. In New York, my Kellogg's cards would eventually curl up like crazy over time, but out here in the ridiculous desert-like Northern California area, the cards I have remain as flat as boards.
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Most cards that use a different material on one side vs the other have this. For example, more recent Chrome cards for Bowman and Topps will do this. They are one side plastic and the other is cardboard. I am thinking that one side is contracting vs the other, and they end up in a bend. For cards without a plastic portion like Chrome or Kellogg's 3D, it could also be that the front uses a gloss that makes that side act the same way as the plastic counterpart.
You can also get a similar effect on some different types of cards by leaving them in the sun for too long.
I have seen water or moisture damaged cards turn out this way also.
I think that it could be a variety of reasons why a card may end up being that way.