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.Gold is usually thought of as being a shiny metal -- however, in its [nano]porous form, gold actually appears dull and black. The surfaces of nanoporous gold are rough and the metal loses its shine. Michel Bosman at the A*STAR Institute of Materials Research and Engineering and co-workers have now experimentally demonstrated that the dullness is a consequence of the way incoming light couples to the electrons on the gold surface.
Originally posted by Lagrimas
because the colors are very vivid pinks, purples and yellows, which is not something I would have expected.