Irogane

thumb|Unpatinated shakudō Shakudō (赤銅) is a Japanese billon of gold and copper (typically 4–10% gold, 96–90% copper), one of the irogane class of colored metals, which can be treated to develop a black, or sometimes indigo, patina, resembling lacquer. Unpatinated shakudō visually resembles bronze; the dark color is induced by the niiro artificial patination process, involving boiling in a solution, generally including rokushō.

thumb|right|Japanese_sword_mountings#Components|Kashira made of dark-finished shibuichi, with gold highlights

Kuromido (Japanese: 黒味銅) is an historically Japanese copper alloy, typically of 99% copper and 1% metallic arsenic, one of the class of irogane metals.