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<p>[QUOTE=&quot;daveydempsey, post: 10590667, member: 22&quot;]Vinegar is an acid and will corrode the metal.</p><p><br /></p><p>On ancient or even 17th, 18th century copper coins that have verdigris, I soak them in virgin olive oil.</p><p>Really stubborn verdigris can take up to 6 months soaking, but it works.[/QUOTE]</p><p><br /></p>

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