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<p>[QUOTE=&quot;medoraman, post: 2236511, member: 26302&quot;]I am not in the mood to get into the weeds with you guys since its been 25 years since my last physics class, but love the posts. The one thing I would reiterate is the affect of smoke. I bought a byzantine coin once, (pretty high gold content), and was surprised it was a &quot;toned&quot; color. Well a soak in acetone later and it was bright gold color again. I have literally bought entire collections from a smokers house, with a large percentage of the coins looking lightly toned. So another aspect to always consider in this discussion is surface depositions of light films giving &quot;toned&quot; appearances. Like Doug believing his eyes, I believe mine. That toned gold coin became &quot;untoned&quot; with a quick cleaning.[/QUOTE]</p><p><br /></p>

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