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<p>[QUOTE=&quot;Detecto92, post: 1348566, member: 75105&quot;]Erm sorry. I&#039;m a from a metal detecting forum and I&#039;m used to talking about dug coins.Anyway, what you have on the coin is called verdigris, it&#039;s an oxidation of copper. Don&#039;t want to try anything harsh, as you will lift verdigris completely off. Once verdigris starts, it pits into the base layer of the coin, the pitting is IRREVERSIBLE.Many times people will make a mistake of using some harsh method to remove it. It WILL remove it, but it will leave behind any ugly pitted layer.Olive oil is good for green coins (dug coppers), but it can darken the coin some.Acetone won&#039;t work well because it has no penetrative properties. Give the coin a soak for about 3 days in mineral oil. This will loosen the verdigris up. Then I would try using a toothpick to scrape it off.After that soak the coin in acetone for a few minutes, it will strip the oil off the coin.Remember, once verdigris stops, you can&#039;t remove it completely or you will expose the pitted layer. You can only remove the excess oxidation, and store it in a low humidity environment to keep it from happening again.[/QUOTE]</p><p><br /></p>

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