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<p>[QUOTE=&quot;yakpoo, post: 7768535, member: 18157&quot;]This may be common knowledge to you (and most people), but I bring it up because it was new to me when I read it. Toning, if allowed to continue, is a progressive event. As oxidation grows, its index of refraction changes which disperses different frequencies of the visible light spectrum. </p><p><br /></p><p>It begins with a white haze (all colors), then progresses through the light spectrum as its thickness grows. The most colorful natural examples developed slowly, over a long period of time. </p><p><br /></p><p>There&#039;s obviously much more to the subject than that, but that was the nugget that stuck with me. When I view toned coins now, I visualize the the thickness of oxidation as a function of color.</p><p><br /></p><p>[ATTACH=full]1332109[/ATTACH][/QUOTE]</p><p><br /></p>

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