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T206Collector...submitted a T206 card to SGC without realizing that there was a small amount of paper glued to the front of the card -- it blended right in with the player's jersey. When I got it back as an SGC 10, I looked and looked until finally I saw the piece of paper. I cracked the card, soaked it, removed the paper and glue and then resubmitted it to SGC. It came back as an SGC 40/3, which is what I thought it would grade the first time.
Soaking, by the way, will also reduce or minimize wrinkles in cards, and special erasers will remove writing without damaging the card.