Mordant for imitation of patina on copper and bronze items. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Mordant for imitation of patina on copper and bronze items. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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That beautiful malachite or bluish-green coloring that ancient bronzes have, occurred under the influence of a very long exposure to either a humid atmosphere or moist soil in which they were located. Chemical research has shown that the cause of this patina (Patina antica) is the formation of a more or less thick layer of copper carbonate on the surface of copper or bronze, i.e. the same copper salt that malachite consists of. A real patina is identical with malachite not only in composition and appearance, but also in origin.

Here is the recipe mordant to imitate patina on copper and bronze items.

In order to artificially obtain a green coloring very similar to real patina, it is necessary, as far as possible, to imitate the process by which the natural formation of patina and malachite is accomplished, i.e. put things under conditions that cause the slow and gradual formation of copper carbonate on their surface.

To do this, things are transferred to a room with a uniform, moderately warm atmosphere, rich in moisture and carbon dioxide; leave them here for a more or less long time, lubricating their surface at least two or three times daily with a 1-2% vinegar solution.

If there are no such ready-made premises at hand, then special chambers of the appropriate size and with tightly locked doors are arranged. For the constant formation of carbon dioxide, one vessel with crushed limestone or chalk is placed on the floor of such a chamber, and at the top, above this vessel, another smaller vessel is strengthened, from which hydrochloric acid continuously and evenly drips onto the chalk or limestone. Wetting small things with a diluted solution of acetic acid is done by immersing them in the solution, and large things by pouring them from above in the form of a fine rain or spraying them with a spray gun. Moisten in this way should be at least twice a day. When the green coating on the surface of the thing becomes already noticeable, the acetic acid wetting solution can be further diluted with water or even replaced with water.

For the formation of a proper layer of patina, it is necessary to continue the described treatment from 2 to 6 weeks. The richer the bronze, the more acidic the wetting solution, and the higher the chamber temperature, the faster the process. But the patina is more natural if its formation is slow.

Before starting the operation, the slightest traces of fat (from fingers, for example) should be removed from things, for which small things are washed with strong lye and, if possible, they try not to touch them with their hands anymore.

Author: Korolev V.A.

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