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<p>[QUOTE=&quot;desertgem, post: 2670339, member: 15199&quot;]Well, it is a toning phenomena. ANY color on metal besides the elemental color is from thin film interference of light. </p><p><br /></p><p>See :<a href="https://forums.collectors.com/discussion/708296/towards-an-understanding-of-the-color-progression-on-toned-coins" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://forums.collectors.com/discussion/708296/towards-an-understanding-of-the-color-progression-on-toned-coins" rel="nofollow">https://forums.collectors.com/discussion/708296/towards-an-understanding-of-the-color-progression-on-toned-coins</a></p><p>,,, and some other links you can google under Sunnywood.</p><p><br /></p><p>Chemical, heat, radiation , even hi energy light can cause toning by increasing a deposit of resultant material from such. The chemical type can originate from a loci of reaction, even on an uncirculated coin. The light waveform from sources&nbsp; have different penetrating power before they bounce off and produce an interference patter of color. Similar to thin oil film on a puddle. Different light sources have difference energy levels and artificial light is limit, whereas natural lighting usually has a mixture of wavelengths. </p><p><br /></p><p>It isn&#039;t 8th grade Science either .</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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