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<p>[QUOTE=&quot;GDJMSP, post: 135521, member: 112&quot;]It could be a soap residue left on the coins, but since you say it is greenish blue it may also be verdigris. If it is - water isn&#039;t going to clean it off. But you can certainly try that first. You could also try acetone to clean them - not the fingernail polish remover, pure acetone you buy at a hardware store. And if that doesn&#039;t work either - then it&#039;s probably verdigris.</p><p><br /></p><p><a href="http://dirtyoldcoins.com/store/product.php?productid=12&amp;cat=2&amp;bestseller" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://dirtyoldcoins.com/store/product.php?productid=12&amp;cat=2&amp;bestseller" rel="nofollow">THIS</a>&nbsp; will remove it.[/QUOTE]</p><p><br /></p>

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