i normally don't mind a bit of green on my copper coins, but in this case, the green sort of ruins the picture of the saint on the coin. i tried looking for any post containing advice on what to do with it. i asume it can be dealt with somehow, whitout damaging the coin much, however, it is not exactly a mint condition coin, so a tiny bit of wear wouldn't do much to it. this is the coin. a venetian 12 deniers from the turn of the 16th century i think. if anyone know of a post/thread that gives a good solution to this, or you just happends to know something that will work, please let me know.
If it's a gooey green then give the coin an acetone bath. The problem is more likely from PVC exposure.
PVC residue is not always gooey, nor is it always green. It comes in many different colors ranging from almost clear, to whitish, to greenish, to brownish. And it can be oily, gooey, dried out, and even flaky. But acetone will remove any and all of it. Verdigris on the other hand is often crusty & powdery looking if looked at closely with a loupe. And acetone will not remove verdigris. VerdiCare will remove it, to a limited degree, depending on how severe the verdigris is. And verdigris is contagious, if one coin with verdigris comes into contact with another coin, the other can and often will develop verdigris itself. But verdigris can seemingly appear right of thin air if conditions are right. One of those conditions is moisture, and that doesn't necessarily mean liquid water. The humidity in the air is enough to cause verdigris to develop. That is why proper storage is so important. And verdigris, while most commonly found on copper coins, is also found on silver coins and even on gold coins. So don't think that copper coins are the only thing you have to worry about.
