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<p>[QUOTE=&quot;shanxi, post: 4514167, member: 101607&quot;]No, not at all. </p><p><br /></p><p>Maybe the seller did some oxidation process or heated the coin to accelarate the process, but this kind of color appears also quite natural with time.</p><p><br /></p><p>You start with blank silver, then it oxidation starts. A very thin layer is formed, which becomes thicker and thicker. In a certain thickness range you get a interference of layer with the visible light, resulting in nice colors, starting with yellow, gold and also blue, depending on the thickness of the layer. </p><p><br /></p><p>But the growth of the layer thickness goes on, and with time you leave the range of interference with the visible light. Your coin becomes grey&nbsp; or even black. </p><p><br /></p><p>This happens not for all coins. If the oxidation is imhomogenous you have a mixture of colors and the result is brown or grey.[/QUOTE]</p><p><br /></p>

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