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<p>[QUOTE=&quot;John Conduitt, post: 4863853, member: 109923&quot;]According to [USER=99239]@Suarez[/USER] on this thread <a href="https://www.cointalk.com/threads/mint-state-ancient-bronze-and-copper-coins.365252/page-2" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/mint-state-ancient-bronze-and-copper-coins.365252/page-2">https://www.cointalk.com/threads/mint-state-ancient-bronze-and-copper-coins.365252/page-2</a></p><p><br /></p><p>...once copper has been touched, the tarnishing process is irreversible. He&#039;s talking about ancient coins, but the principle is the same.</p><p><br /></p><p>As far as water is concerned, it&#039;s one of the causes of corrosion (as it allows chemicals to change to more destructive ones), so adding it would only help if you know exactly what&#039;s on the coin (and, indeed, exactly what the coin is made of) and how it will react. This is why the most common answer you&#039;ll get is &#039;leave them alone.&#039;</p><p><br /></p><p>Suarez&#039;s full explanation:[/QUOTE]</p><p><br /></p>

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