Some of the most brilliant colors found on butterflies, birds and squid are produced by nanostructures on wings, feathers and skin that reflect light. The effects can become even more varied when these “structural” colors are combined with filters made from light-absorbing pigments. For example, the characteristic green plumage of parrots seems to be produced by yellow pigment over a blue reflective nanosurface
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Paintings Made with Iridescent Nanopaints Change Color on the Spot