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<p>[QUOTE=&quot;desertgem, post: 1867621, member: 15199&quot;]There are several &quot;tales&quot; of proper sequences, but from the scientific level the one in the chart below url appears to be the best discussion on it.&nbsp; It depends on the thickness of layers of toning material to produce the colors by thin film interference ( like oil skim on the surface of water).&nbsp; Also you might follow the various other threads at the beginning of this one. The colors were determined by the mathematical angles for differing # of layers.&nbsp; This recognizes that the colors are interference and not spectral such as the colors your fellows mentioned which are the order of colors in the rainbow, or transmitted.&nbsp; </p><p><br /></p><p>Jim</p><p><br /></p><p><a href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279&amp;highlight_key=y&amp;keyword1=color&amp;keyword2=chart" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279&amp;highlight_key=y&amp;keyword1=color&amp;keyword2=chart" rel="nofollow">http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279&amp;highlight_key=y&amp;keyword1=color&amp;keyword2=chart</a>[/QUOTE]</p><p><br /></p>

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