I'm not saying that there isn't a method to doing it and if there is I would love to know it, but a few years ago I tried to flatten out some mint 1974 Kellogg's that were curled that I bought on eBay, and when I checked on them after a few days they were all exploded. I haven't tried it since.
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“interesting to some absolute garbage to others.” —- “Error cards and variations are for morons, IMHO.”
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