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To Dye Ivory Dark Lemon

Dissolve ounce picric acid in ounce boiling water. Dilute 1/80 ounce strong sulphuric acid with 4 ounce hot water, by pouring the acid 1999. Το Bleach Articles made of Ivory. This process is recommended by Dr.

J. Artus. The objects made of this substance are first placed into a solution containing 11+ ounces carbonate of soda in crystals, and 45 ounces water. After having been left in this fluid for 2 days, the ivory objects are well gradually into the water. Insert the ivory in washed in pure water, and then immersed into the acidulated water, turn it around repeated- a solution composed of 17 ounces sulphite of ly, in order to admit the acid to all parts, re- soda, and 454 ounces water, and kept therein move the ivory from the fluid and dry it. for 5 or 6 days, after which time there is Then insert the dried ivory in the boiling so- added to the liquid, yet containing the ivory lution of picric acid, turn it also around, and objects, 1 ounce hydrochloric acid diluted leave it in the solution until all parts appear with 5½ ounces water. After the acid has of a uniform yellow color. Then remove it been added, the vessel (glass or porcelain) from the solution of picric acid, dry, and pol- containing the liquid and ivory should be ish the ivory with soap water and finely levi- covered and left standing for from 24 to 36 gated chalk. After the polishing the ivory possesses a permanent dark lemon-yellow color.