Green mordant for copper, brass and bronze items. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Green mordant for copper, brass and bronze items. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Color in green color surface of copper, brass or bronze products possible in various ways.

1) The surface of things with a sponge is first lubricated with a highly diluted solution of copper nitrate with the addition of a small amount of sodium chloride. Then, when the thing dries, it is smeared in exactly the same way with a solution of 1 part potassium oxalate and 5 parts ammonia in 94 parts weak vinegar. Allow to dry again and again lubricate with the first solution; then, after drying, again with a second solution, etc. alternately until the staining has acquired the proper strength.

Before lubrication, the sponge soaked in the solution should be squeezed hard so that it is damp, but not wet.

At the end of the surface painting, things are carefully rubbed with hard hair brushes, especially in recesses and crevices.

After 8-14 days of work, a brownish-greenish coloration is obtained.

2) Things are rubbed in several steps with a cloth soaked in crude oleic acid (a product obtained in stearin factories). On the surface of things, a dark green layer of copper oleic acid is first formed, which, under the influence of oxygen and atmospheric moisture, gradually turns into lighter green copper carbonate.

The process is significantly accelerated if oleic acid is first insisted on copper shavings for quite a long time, and after each lubrication with such acid, after the lubricant dries, lightly (no more than a few drops!) Spray with an aqueous solution of ammonium carbonate with a spray bottle.

Author: Korolev V.A.

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