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<p>[QUOTE=&quot;gxseries, post: 132155, member: 4373&quot;]Chemistry wise, once you have verdigris on copper coins, there is nothing you can do, except to slow it&#039;s rate of damage, or dip it into olive oil and let olive oil slowly eat away the corrosion. But remember olive oil itself is a weak acid. Of course that explains why vinegar helps in the cleaning because it&#039;s a stronger acid than olive oil. </p><p><br /></p><p>Time itself is a factor - sometimes if you leave it in the solution for too long, you might as well let the coin dissolve in hydrochloride acid...[/QUOTE]</p><p><br /></p>

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