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Coloring Fluid For Brass.
Оглавление—Caustic soda, 33 parts; water, 24 parts; hydrated carbonate of copper, 5.5 parts.
Dissolve the salt in water and dip the metal in the solution obtained. The intensity of the color will be proportional to the time of immersion. After removing the object from the liquid, rinse with water and dry in sawdust.