Quote:
Originally Posted by Cliff Bowman
High humidity causes the plastic covering to shrink in size but does not affect the cardboard part of the card under the plastic coating, this is what causes the cards to curl up if they’re not slabbed or in a rigid holder, and to crack if they are slabbed or in a rigid holder.
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Makes sense. So for those that are already slabbed and not cracked, just keep them out of humidity?