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<p>[QUOTE=&quot;TIF, post: 3014027, member: 56859&quot;]I soaked it in white vinegar and gently dabbed it with a cotton-tipped swab.&nbsp; The green and blue copper compounds dissolved off readily.&nbsp; Afterwards I rinsed it in distilled water a few times (and soaked it), dried it, and applied VerdiCare.</p><p><br /></p><p>Coins of Pontos (and some other Black Sea locales) used a copper alloy that is a little different from others and it seems to tolerate this type of cleaning.&nbsp; I wouldn&#039;t use a weak acid to clean an Alexandrian tetradrachm, for instance.[/QUOTE]</p><p><br /></p>

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