Brown mordant for iron and steel items. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Brown mordant for iron and steel items. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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To obtain brown mordant for iron and steel things usually antimony oil (Butyrum antimonij) mixed with olive or other vegetable oil is used.

With this mixture, by means of a cloth, rub the surface of an iron or steel thing. When a day after the first rubbing, the surface becomes covered with rust, it is rubbed with the same composition a second time, then a third time, etc. Continue this until the desired coloration is obtained - from light to dark brown, depending on the number of rubbing. This staining is due to the deposition of iron oxide and metallic antimony on the surface of things.

The coloration of iron in a metallic lustrous dark brown color can be obtained if iron, previously heated to the boiling point of water, is immersed for a moment in a 10% aqueous solution of red chromium salt (potassium bichromate), dried in air and then held for 1-2 minutes over hot charcoal. The operation is repeated two or three times until the desired shade is obtained.

When finished, rinse, dry and wipe with a cloth lightly moistened with linseed oil. But for success it is necessary that the iron be heated to a temperature of 100 °C (or very close).

If the heating was insufficient, then the staining is bad and the water in which the iron is washed at the end of the operation turns yellow, if, on the contrary, the iron was heated too much, the staining color will not be brilliant brown, but matte black.

Author: Korolev V.A.

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