Rokusho

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Rokusho is a traditional Japanese compound for inducing patination in decorative non-ferrous metals, especially several alloys which are nearly unknown outside Japan. Shakudo becomes dark blue-violet, shibuichi misty aqua, and kuromido dark coppery black; rokusho was generally used to patinate all types of mokume-gane as well. Although other patination agents can be used on these metals, some artisans prefer to maintain tradition despite the unavailability of premixed rokusho outside Japan.

Several different formulas have been proposed to replicate the commercial product:

  • In a container made of glass, porcelain, or copper, dissolve 6g copper acetate, 2g calcium carbonate, and 2g sodium hydroxide in 150ml water. After a week, siphon or decant the clear liquid from the top; just before use, add another 2g copper sulfate.
  • Dissolve 4g copper acetate, 1g copper nitrate, 1g cupric chloride, and 4g copper sulfate in 1L distilled water.
  • Dissolve 60g copper acetate and 60g copper sulfate in a 2L solution of white vinegar diluted 5-12% with water.
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