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<p>[QUOTE=&quot;BadThad, post: 1820144, member: 17261&quot;]If you see green/blue-green on a copper coin, it is verdigris.</p><p><br /></p><p>Generally, ancients excluded, removing heavy verdigris will result in an undesirable coin. Since verdigris is corrosion, it actually removes copper from the coin in order to form. Once removed, you will have pitting and other surface problems exposed. Yes, all forms of verdigris can be removed - however, the amount of damaged caused by the removal process from using peroxide, acids, etc. end up being a bigger problem than the corrosion itself.</p><p><br /></p><p>You have to weight the benefit of removal versus the end-value of the coin. With common, modern coinage it&#039;s usually not worth the time and effort (for most coins) since it&#039;s more economical to simply replace a heavily corroded coin.[/QUOTE]</p><p><br /></p>

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