Shakudō
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Shakudō is a Japanese billon of gold and copper, one of the irogane class of colored metals, which can be treated to develop a black, or sometimes indigo, patina, resembling lacquer. Unpatinated shaku
Unpatinated shakudō
Fuchi. Shakudo, gold, copper alloy (sentoku). The Walters Art Museum.
Orichalcum
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Orichalcum or orichalc is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias of Plato. Within the dialogue, Critias says that orichalcum had been considered
Orichalcum found in Gela, Sicily
An orichalcum sestertius issued under Nero, perhaps depicting the equestrian Troy Game, a kind of cavalry parade (decursio)