The only pigment in the peacock tail is melanin, which gives the barbs a uniform brown color. This provides a dark background color for the thin–film interference in the keratin layers. The different colors in the eye pattern result from minute changes in the depth of thickness of the keratin layers. In order to produce a particular color, the keratin thickness must be accurate to within about 0.05 μm
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http://www.wonderwhizkids.com/index.php/peacock-colors
http://www.wonderwhizkids.com/index.php/peacock-colors
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