Is there any way to prevent these kind of cards from curling? I've had these cards in an album since I pulled them way back then and not long after being in the album they became curled. I pulled them all out, put inside individual sleeves and placed between 2 hard flat surfaces with weight on top to flatten them out. It worked, but only for about 2 days and they were right back to being curled. I had them under that weight for 6-8 months or longer and it still didn't keep them straight. So my question is, does anyone know something I apparently don't? Is there any solution to prevent/fix this problem?
Thanks, Dan