A new study has shown the colors of 40 million year old feathers, opening up the posibility of decoding the pigments of dinosaurs. The feather colors are produced by light scattering off of the feather's exterior and a smooth surface of melanin pigment granules within the feather's protein. Following up on the new finding, scientists are are racing to discover what additional coloration features may be found in fossil feathers.
http://www.macroevolution.net/iridescent.html
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