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<p>[QUOTE=&quot;Evan8, post: 2500570, member: 74343&quot;]That&#039;s not entirely true. Natural toning, if you want to call it that, from my understanding, is from a layer of silver sulfide. Take Morgan dollars for instance. The ones that sat in mint bags for years. Those bags were treated with sulfer to keep rats from chewing through them. The coins that were touching the canvas gained a this layer of silver sulfide that retracts the light shining upon the surface and what we see is that breakdown of light reflecting back to our eyes, also called color. Its not that the metal is breaking down, some cases maybe, but the toning that those Morgan&#039;s took years to build up is just a chemical layer on the surface of the coin.</p><p><br /></p><p>It looks pretty so people created a market for them, and now every coin that exhibits color needs a &quot;premium&quot; just because some amazing looking common date Morgan sold for really high prices due to toning.[/QUOTE]</p><p><br /></p>

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