Shibuichi (四分一) is a historically Japanese copper alloy, a member of the irogane class, which is patinated into a range of subtle greys and muted shades of blue, green, and brown, through the use of niiro processes, involving the rokushō compound. == Naming == Shibuichi means "four plus one" in Japanese, and indicates the standard formulation of one part silver to four parts copper, though this may vary considerably according to the desired effect.
Shibuichi (四分一) is a historically Japanese copper alloy, a member of the irogane class, which is patinated into a range of subtle greys and muted shades of blue, green, and brown, through the use of niiro processes, involving the rokushō compound. == Naming == Shibuichi means "four plus one" in Japanese, and indicates the standard formulation of one part silver to four parts copper, though this may vary considerably according to the desired effect.
Source: Wikipedia "Shibuichi" · CC BY-SA 4.0
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