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Posted By: davidcycleback

I was once doing tests on how to identify alterations to cards. One test involved soaking
the cards in various liquids, from tap water to bleach. At the top of the each card I wrote
in pen the substance it was being soaked in. When I came back a while later, the writing on
one of the cards had disappeared-- completely gone. At first, I thought I had forgotten to label
the card, but realized what had happened. I had unintentionally discovered a liquid to
remove the ink from cards. The writing wasn't even submerged in the liquid. The sneaky liquid
wicked up the card.