Quote:
Originally Posted by insidethewrapper
I notice that the 1st and last cards of sets at times turn brown in the boxes. Not sure what that means, didn't do well in chemistry. But I notice that a lot of my cardboard in the warehouse has faded , probably due to extreme summer and winter temperatures.
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That may be it, if the box is a really acidic one, that can transfer to the paper or cardstock next to it. It happens a pot with old envelopes that have newspaper clippings inside.