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<p>[QUOTE=&quot;RonSanderson, post: 2458670, member: 77413&quot;]Does mineral oil break down over time? If so, would these by-products become a dull film on the coin, or even react with the surface metal? (Not that it&#039;s an issue with the OP&#039;s cent.)</p><p><br /></p><p>I bring this up because I saw a thread, I think from 2009, where one poster promoted an olive oil soak. The thread had pictures of coins that had been treated 10-15 years earlier. They were flat and dull. I wondered if the coin was permanently damaged, or whether this was a film of degraded olive oil that could be rinsed off.[/QUOTE]</p><p><br /></p>

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