| http://www.w3.org/ns/prov#value | - The coating comprises at least one layer of a reflective metal, such as gold, copper, aluminum and preferably silver, and at least one layer of a metal compound which can provide color by both absorption and interference effects at various relative thicknesses, such as the oxides and/or nitrides of metals such as iron alloys, nickel alloys, copper, iron and cobalt.
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