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<p>[QUOTE=&quot;SuperDave, post: 2901847, member: 1892&quot;]Silver toning is simply a chemical combination between silver and sulfur, forming silver sulfide on the surface of the coin. Past a certain toning thickness (and this is measured in molecules), there is no longer any &quot;fresh&quot; silver for the sulfur to reach and react with, and the reaction stops. Same for copper - that&#039;s why the Statue of Liberty (and copper roofs across Europe which are centuries old) have not rotted away.[/QUOTE]</p><p><br /></p>

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