I had my card in the water for about 5-10 minutes and changed the water about three times because of the amount of paper that was coming off of the card. Then I patted it dry with paper towel then wrapped it in fresh paper towel and put it under a stack of big art books for about a week changing the paper towel out every day. The creases are even more faint in hand than in the scan, but the Piedmont printing on the back is now almost black instead of blue. I am guessing that it was some kind of reaction to the glue that was used on the card.
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