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<p>[QUOTE=&quot;WriterIN, post: 1370856, member: 35620&quot;]I can&#039;t really tell from your photo, but green usually equals copper salts, which means that the zinc plating has been penetrated and the Miracle of Modern Chemistry has begun. You can&#039;t reverse it, but you can stop it by keeping it very, very dry. Any humidity (atmospheric, heavy breathing, doggy licks, etc.) combined with good old oxygen (There was something in the air, that night, Fernando...) will reactivate the corrosion process.</p><p>There&#039;s also a possibility that it&#039;s organic, like a germ colony in a petri dish. </p><p><br /></p><p>If you MUST clean it, try this Wash it *gently* in warm sudsy water. Use a Q-tip to dab at the spot only to avoid damaging the rest of the coin. Pat Dry it *completely and immediately* and see if the spot has thinned or reduced. **THIS IS A HIGH RISK PROCEDURE. YOU CAN DO EVERYTHING RIGHT AND STILL MANAGE TO DAMAGE THE COIN**. It&#039;s usually best to just let it be.[/QUOTE]</p><p><br /></p>

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