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Message:: [QUOTE="-jeffB, post: 4099085, member: 27832"]I'm afraid I find them a little terrifying. Most of those flips have a ghost impression that's greenish -- and that implies that they've been corroding the coins they held! If you look at the coins you took out of those flips, you'll likely find that a lot of them have some green discoloration. They may have sticky spots. This is active PVC damage, caused by chemicals used to make the plastic soft. It's damaging because the sticky stuff contains an acid that corrodes the coin's surface. To get rid of it, you can soak the coins in pure acetone, the kind that comes in a can at a hardware store (not fingernail-polish remover, which often contains other stuff as well). Soak each coin for a few hours (in a sealed container), then take it out, dip it in fresh acetone to rinse it, and stand it on edge on a glass or metal surface (not plastic) to let the acetone evaporate. Do all this in a well-ventilated area, away from flame. Of course, I could be misinterpreting your photo, and everything could be fine. But those look like flexible (soft) flips, and that means they're likely to be PVC. If I were you, I'd check the coins very carefully. Good luck![/QUOTE]