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<p>[QUOTE=&quot;Bill in Burl, post: 2650648, member: 23692&quot;]I&#039;ve found that, working with large cents, if the vertigris is hard or compacted that you can get it off with a combination of thorns and chemicals.&nbsp; However, once you get the hard stuff off, you will find that there is a hole/pit/depression where the metal has physically corroded into the copper.&nbsp; Many times, when I get the hard green crap, I just leave it like it is, because that is less noticeable than the black hole/pit that it leaves.&nbsp; The soft green oily stuff from pvc comes off easily with acetone.[/QUOTE]</p><p><br /></p>

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