Shibuichi
Shibuichi is a Japanese alloy of copper and silver, typically with a silver content of 25% or higher. The name "shibuichi" translates to "four-to-six," referring to a historical ratio of 4 parts silver to 6 parts copper, though modern usage often involves higher silver percentages. This alloy is prized for its unique patina, which can range from a dark, almost black hue to various shades of grey and brown depending on the treatment.
The development of shibuichi is closely linked to the art of Japanese metalworking, particularly in the creation