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<p>[QUOTE=&quot;BadThad, post: 617820, member: 17261&quot;]Completely agree. </p><p>&nbsp;</p><p>Anyhow, you should always start with deionized water before using any organic chemicals. For copper, my first choice for removing organic debris is always xylene. I&#039;ve NEVER had xylene produce ill effects on a natural copper coin. </p><p>&nbsp;</p><p>I&#039;ve never had a problem with acetone either, but it&#039;s so polar I&#039;ve found it doesn&#039;t usually accomplish anything on copper. One mistake people have made with acetone is leaving a coin in it too long or exposing the soaking coin to sunlight. This forms an acetate radical which will attack any metal and form verdigris.[/QUOTE]</p><p><br /></p>

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