Manufacturer and Builder 8, 1886
To color brass steel-gray or black, add one part of hyposulphate of soda and two parts of sulphate of copper to 100 parts of water. Cleanse thoroughly the object to be colored, place it in the mixture and heat the whole. A darker tint is produced by adding more hyposulphite of soda, while a larger quantity of sulphate of copper will induce a bluish or steel gray color.
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