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<p>[QUOTE=&quot;Kentucky, post: 8199098, member: 33176&quot;]Mineral oil is good for giving some &quot;life&quot; to duller copper surfaces, but hard to avoid the wet look.&nbsp; Petroleum jelly is essentially the same, just a more solidified version that should last somewhat longer.&nbsp; With either of these hydrocarbon treatments, I would be concerned that the chemicals would fog the interior of the coin capsule or flip that the coin is in.&nbsp; Since the coins to be treated are free of grit (hopefully) a gentle rub with a soft cloth would remove more of the oil and lead to a better appearance IMHO.[/QUOTE]</p><p><br /></p>

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