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<p>[QUOTE=&quot;desertgem, post: 1817179, member: 15199&quot;]I believe Doug was commenting about the natural toning progression of color as the surface refraction layers increase from sulfides in the atmosphere being deposited.</p><p>Sunnywood determined a color classification for toned coins, consisting of 4+ cycles before the thickness of the layer became the &#039;terminal&#039; black color.&nbsp; As the cycles increase , the progression go from light gold to burgundy and then next stage goes back to the lighter colors, etc. So as toning progresses though the refraction spectrum, the color gold/yellow/gold shows up 3 times as the colors cycle through the spectrum. I think this is what Doug meant as he is aware of Sunnywood&#039;s progressions. In one of my older threads, I listed both of Sunnywood&#039;s threads he had on CU. I don&#039;t believe a person can understand toning color progressions without the knowledge contained there. The spectrum you show above is based on transmitted light, and not reflected and refracted light.[/QUOTE]</p><p><br /></p>

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