Researchers have figured out how to use a specific engraving technique in order to alter the frequency of light a metal—any metal—absorbs or reflects. How? By carving tiny rings, smaller than the wavelengths of light.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/u1Oh3nxsHoI/pretty-soon-your-gold-wedding-band-can-be-any-color-you-want
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