Black mordant for bronze. simple recipes

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

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Usually as clean blackAnd gray staining It is obtained by the formation of copper oxide or copper sulfide on the surface of a thing. But both of these colorings can also be achieved by deposition of sulfur compounds of other metals - lead, bismuth, mercury, etc. on the surface of the thing.

Will the coloring be completely black or light black, i.e. gray, depends both on the composition that causes the color, and on the time of action of the latter. For the formation of black oxide of copper on the surface of things, the heated thing is immersed for several seconds in a solution of copper in excess of nitric acid and then held over a charcoal fire until its surface begins to turn black. To obtain a uniform and sufficiently dense black color, the operation is repeated several times, otherwise the color will not be completely black, but grayish. At the end of the staining, the thing is wiped with a cloth soaked in oil. Optical instruments are usually blackened in this way.

For brass and bronze You can also use the following solution: 2 parts arsenic (not arsenous!) acid, 4 parts hydrochloric acid, 1 part sulfuric acid and 80 parts water. Arsenic acid can be replaced with antimony oil (antimony trichloride). The item is immersed in a solution heated to 50 °C, and during immersion it is touched with a zinc stick.

A solution of double salt of sodium sulphate and lead gives a very good color: dissolve 45 g of lead sugar (lead acetate) in 3/4 liter of water, and 150 g of sodium sulfate (hyposulfite) in 1/2 liter of water. Mix both solutions and heat to 85-93 °C. The surface of an item immersed in the solution is very quickly covered with a layer of lead sulphide. The color of this layer changes as it thickens and in the end becomes very beautiful - metallic gray.

In a similar way, black staining with bismuth sulfide is obtained. To do this, the thing, painted, as explained above, with a brown bismuth nitrate solution, must be immersed while still hot in a strong solution of sulfuric liver (Hepar sulfuris) - the brown color quickly turns into black.

Author: Korolev V.A.

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