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<p>[QUOTE=&quot;lordmarcovan, post: 3104550, member: 10461&quot;]Well, you certainly don&#039;t want to go at it <i>too</i> hard and mess up that nice original toning, but if you soak the coin in acetone and then get out your loupe and either a toothpick or rose thorn to work at that green crud, maybe it&#039;ll come off and leave the original &quot;skin&quot; beneath intact. </p><p><br /></p><p>(Toothpicks, bamboo skewers, and rose thorns are often hard enough to use as fine-pointed tools without being hard enough to scratch the metal of the coin.)</p><p><br /></p><p>Cleaning <i>loose grime and surface deposits</i> off a coin needn&#039;t always be a no-no, IF you&#039;re working carefully and not disturbing the underlying surfaces and toning.</p><p><br /></p><p>The only downside to this is that removing surface deposits off a coin can sometimes reveal untoned &quot;new&quot; metal beneath, which might not match the rest of the toning.</p><p><br /></p><p>But I think that threepence might respond well to a short soak and a little fine work with a bamboo skewer on the green deposits.[/QUOTE]</p><p><br /></p>

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