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<p>[QUOTE=&quot;BadThad, post: 1478131, member: 17261&quot;]Corrosion (verdigris) on copper coins is very common. It is classsified as light, moderate and heavy. Heavy corrosion cannot be removed without permanently damaging the surfaces. Light to moderate verdigris can usually be successfully conserved.</p><p><br /></p><p>Any coins with verdigris should be separated and kept away from non-verdigris coins. Verdigris from one coin can provide feed materials to other coins prompting them to also corrode. Here&#039;s an example I found in a roll. The brown coin had verdigris which spread to the reverse of the red coin next to it in the roll.[/QUOTE]</p><p><br /></p>

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