Colors are produced in a variety of ways. The best known colors are pigments. However, the very bright colors of the blue tarantula or peacock feathers do not result from pigments, but from nanostructures that cause the reflected light waves to overlap. This produces extraordinarily dynamic color effects. Scientists have now succeeded in replicating nanostructures that generate the same color irrespective of the viewing angle.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/11/161117082459.htm
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