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<p>[QUOTE=&quot;ziggy9, post: 383441, member: 8360&quot;]olive oil is mildly acidic and will eventually eat the surface of the coin. There is a product to use on copper that is much like using acetone on silver. its called xylol or xylene. The fumes can be somewhat toxic and flamable as well but it will only effect organics. As with all coins do not rub it with the xylol to clean it only soak it or you will scratch the coin. THis is definately something to test on many common dates before ever thinking about a key date.</p><p><br /></p><p>richard[/QUOTE]</p><p><br /></p>

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