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<p>[QUOTE=&quot;Kasia, post: 1304466, member: 31533&quot;]Welcome to CT! </p><p><br /></p><p>Natural toning of coins (rainbow and otherwise) is done by the effects of sulfur and other oxidants on silver or other metals. Its also the same as &quot;tarnish&quot;. But since it can produce beautiful colors, it can be appreciated. Until it can be too much and goes completely black.</p><p><br /></p><p>Natural toning can be differentiated from artificial toning in most cases, either by the progression of colors or how those colors flow on the coin and in between the device and lettering, etc. Artificial toning can be told apart from natural usually by color, color progression, or how it is on the surface, either it looks like it &quot;flowed&quot; on or it covers the devices the same as the field, which usually doesn&#039;t happen with Natural toning.</p><p><br /></p><p>Here is a web page that gives some good information. It&#039;s a start anyways. <a href="http://rg.ancients.info/guide/toning.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://rg.ancients.info/guide/toning.html" rel="nofollow">http://rg.ancients.info/guide/toning.html</a>[/QUOTE]</p><p><br /></p>

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