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<p>[QUOTE=&quot;GDJMSP, post: 185586, member: 112&quot;]Although olive oil is in effect a weak acid I doubt it would do anything to or remove toning. What it does do is to remove encrustation from coins that have been buried in the ground because that it is mainly dirt and mineral deposits. </p><p><br /></p><p>Without seeing the coin in hand it is hard to say for sure what the cause of the dark coloring is. You could take it to a dealer and ask, you could submit the coin to NCS for conservation, or you could submit the coin to a TPG for grading. But to be honest, I doubt it is worth the last 2 options because of the expense. Unless of course the coin is scarce date or variety.[/QUOTE]</p><p><br /></p>

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