People have tried to flatten curled cards without much luck. Putting them in top loaders on under books hasn't been mentioned as a good idea.
What about a thick card top loader? The picture below shows a card in a thick top loader. It doesn't flatten the card fully. I'll leave this for some time and see what happens.
I've found that semi-rigid holders work too.
ReplyDeleteI actually put a few (4) 1982 Kellogg's cards that were badly curled in a thick toploader several months ago. They're much flatter now (although not completely flat) and don't seem to have cracked.
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