I was wondering if any of you guys knows how to best unbend a bent card. I have a few cards that are a little bent, as in the picture below.
In a penny sleeve, Between two non-porous surfaces books, and then put 50 pounds of books on top, leave for a week.
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I guess you mean the curve? I put them between two thick pieces of glass with no sleeves.
I’m in the high desert though so the humidity isn’t really a factor. (We only get some humidity due to all the swimming pools lol)
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If you mean warping just put it inside a book and add some weight to it. I had a very expensive card that got thrown in with a box of commons and unfortunately warped. 3 months inside a book decreased it by 90%. Effective but it takes a while.
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beautiful card btw 
yes I mean warping 
but it seems like putting the card between books under weights will do the job, as I dont have glass like Gary suggests.