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<p>[QUOTE=&quot;John Burgess, post: 6298092, member: 105098&quot;]Hi halfcent1793, Yeah, that&#039;s what I thought about it also, it seemed pretty on the money with what I knew avbout rainbows, prisms, light and lumens and Kelvin of light.</p><p>I&#039;d just never approached it from this angle, and toning was sort of a mystery to me on how it worked and what stage it was in at any given time. I don&#039;t know about the nm of thickness, and cones and wavelengths of light but seems plausible at the least. </p><p><br /></p><p>I wonder at how many coins hit the gold to russet color at the beginning of toning, and were deemed &quot;ugly toning&quot; and dipped to remove it when all it really needed was another few decades to keep progressing......[/QUOTE]</p><p><br /></p>

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