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When gold is not gold(en)
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The deeper the etches on the surface of the metal, the darker the variation in perceived colour of the gold.
Jianfa Zhang, Jun-Yu Ou, Nikitas Papasimakis, Yifang Chen, Kevin F. MacDonald, Nikolay I. Zheludev, "Continuous metal plasmonic frequency selective surfaces," Opt. Express 19, 23279-23285 (2011);
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