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<p>[QUOTE=&quot;GDJMSP, post: 7939118, member: 112&quot;]No, it isn&#039;t. Verdigris is the result of copper corroding - just as rust is the result of iron or steel corroding. Verdigris is what the copper is turned into by the chemical process of corrosion. </p><p><br /></p><p>In and of itself, verdigris is harmless, it does not and cannot do a damn thing to coins. You could leave it there for a thousand years and it won&#039;t do anything to coins. And no it does not and cannot cause more corrosion.</p><p><br /></p><p>The only reason there is to remove it is because it is unsightly. Of course once you do remove it the damage to the coin, (that is underneath the verdigris), that was done by the corrosion will be visible. </p><p><br /></p><p>On all metals, corrosion is caused by two things - moisture and the air.[/QUOTE]</p><p><br /></p>

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