Abstract
The optical properties of metals, and particularly their high reflectivity, are related to the effect on their free electrons of the energy of the incident light, but a satisfactory explanation of the characteristic colours of gold and its alloys and intermetallic phases has become possible only since calculations could be made of energy band structures.
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Saeger, K.E., Rodies, J. The colour of gold and its alloys. Gold Bull 10, 10–14 (1977). https://doi.org/10.1007/BF03216519
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DOI: https://doi.org/10.1007/BF03216519