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<p>[QUOTE=&quot;Kentucky, post: 4901729, member: 33176&quot;]&quot;Not all that glitters is gold&quot;, and not all that is green on a copper coin is harmful.&nbsp; People in the ancient coin forum recognize that some green coloration is not harmful and in many cases adds to the appeal of a coin.&nbsp; The really harmful actor here is what is called &quot;bronze disease&quot; (look it up) which can consume a coin completely.&nbsp; Bronze disease is ascribed to chlorides of copper and is not a protective coating as verdigris may be.&nbsp; For your coin, I would suggest to put a protective plastic net (such as veggies or fruit may come in from the grocery) into a sink so the coin doesn&#039;t slip down the drain, put the coin in it and rinse thoroughly with the hottest water that would come out of the tap.&nbsp; After this hot water bath, you might brush lightly with a soft toothbrush or not and repeat the process to remove any loose material.&nbsp; Afterwards, I would soak a couple of hours in distilled water and then rinse with fresh distilled water and thoroughly pat or blot dry (don&#039;t rub!).&nbsp; Allow the coin to dry thoroughly (heating to 180 or so degrees F is good) and then return to your acrylic or other capsule.[/QUOTE]</p><p><br /></p>

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