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<p>[QUOTE=&quot;Hobo, post: 367756, member: 11521&quot;]Toning is corrosion, a chemical reaction between the metal on the surface of the coin and oxygen and chemicals (e.g., sulphur) in the air. Some toning is attractive and some is ugly. Some people will pay big money for &quot;monster&quot; toning (bold, bright, &quot;pretty&quot; colors). </p><p>&nbsp;</p><p>Be aware there is NT (natural toning) and AT (artificial toning). AT is commonly used to tone a coin to either hide damage or defects or to take advantage of those who pay extra for toning. Search this site for numerous threads about NT and AT. </p><p>&nbsp;</p><p>Manila envelopes contain sulphur and will tone a coin over time (with the end result usually being ugly).[/QUOTE]</p><p><br /></p>

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