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Re: fossil fish colouration

>>This only applies to creatures that exhibit metallic colouration (fish scales,
peacock feathers, etc). In the case of the fossil fish, the scales had been
preserved in sediment so fine grained that electron microscope images revealed
the original minute striations on the scale surfaces. The colour of light
reflected by these tiny ridges repends on their distance appart (there is a
direct correlation between distance between ridges and the wavelength of the
light reflected). Hence by measuring the distance between the minute striations
it was possible to determine what colour light they would have reflected.<<

They used the same method to find the color of Cambrian _Wiwaxia_.