Black mordant for copper. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Black mordant for copper. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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To obtain black mordant for copper prepare a saturated solution of copper sulphate and add ammonia to it until the mixture takes on a bright transparent blue color. The item to be treated is immersed in this solution for a few minutes, then removed and slightly heated until it turns black.

There is another way. The copper thing to be blackened is first cleaned with fine sandpaper, after which they try not to touch its cleaned surface with their fingers. Then it is either immersed in a liquid solution of platinum chloride, or wetted with it with a brush. This solution, if it is not acidic, is slightly acidified with hydrochloric acid.

A very strong blackening of copper products is obtained if they are immersed in a saturated solution of metallic copper in nitric acid and then slightly heated.

Author: Korolev V.A.

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