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<p>[QUOTE=&quot;sand, post: 8169014, member: 118540&quot;]P.P.P.S. : The green spot, on the reverse, may be &quot;bronze disease&quot;, which is copper chloride, if I remember correctly. Especially if it wasn&#039;t there 10 years ago. Not all green material is bronze disease. In fact, a stable green patina, on a bronze coin, is quite desirable, for many collectors of ancient coins. But if the green is new, then probably it&#039;s bronze disease. I&#039;m not an expert in bronze disease. You can scrape it off, using a pointy scalpel. And then maybe soak the coin in distilled water (don&#039;t use chlorinated tap water). But probably other experts would have better ideas, about what to do, about it.[/QUOTE]</p><p><br /></p>

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