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Turtle mordant for horn. Simple recipes and tips
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If they want to give horn products tortoise color, then use the following method. Horn products are first treated with diluted nitric acid (1 part to 3 parts water) at a temperature of 30-35 ° C and then etched with a mixture of 2 parts soda, 1 part freshly burnt lime and 1 part lead litharge.
The effect of the mordant should last no more than 10-15 minutes so that the spots on the horn turn yellow-brown. After this, having washed the mordant from the horn, wipe it with a cloth and place it in a cold dye bath consisting of 4 parts of mahogany decoction (at 10 °Be) and 1 part of sodium hydroxide solution (at 20 °Be). The horn is then removed from the bath, thoroughly washed with water and polished after 12-16 hours. A dye decoction is prepared by boiling 0,5 kg of fernambuco wood in 4-6 liters of water.
If you add tin salts to the mordant, you get a bright red hue.
Author: Korolev V.A.
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