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<p>[QUOTE=&quot;TIF, post: 3145740, member: 56859&quot;]That green looks like hard surface deposits, &quot;malachite&quot;.&nbsp; As Doug said, weak acid will dissolve it.&nbsp; Verdicare will too, although it will take considerably longer.&nbsp; I&#039;d be tempted to do a few quick and carefully supervised vinegar soaks (plus gentle prodding with a cotton-tipped swab and toothpick).&nbsp; Afterwards, I&#039;d soak it in a few changes of distilled water, and then give it a soak in Verdicare.&nbsp; Because Verdicare is more expensive, I &quot;soak&quot; coins by flooding the surfaces and resting them on a glass plate, flipped occasionally and, if there is stuff to be removed, rinsing the Verdicare when it gets fouled and flooding the coin again.&nbsp; I don&#039;t submerge coins in it... that would take too much of it.</p><p><br /></p><p>With vinegar you risk creating or revealing porous surfaces and being left with an undesirably stripped coin.&nbsp; Maybe if you just do it gently and briefly...[/QUOTE]</p><p><br /></p>

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