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The Birth of Nanotechnology, Nanogallery.info, (2006), http://www.nanogallery.info/nanogallery/?ipg=1262007年7月25日閲覧, ""Faraday made some attempt to explain what was causing the vivid coloration in his gold mixtures, saying that known phenomena seemed to indicate that a mere variation in the size of gold particles gave rise to a variety of resultant colors.""