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Aniline Black on Wool

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2568. New Mordant Applicable to 2 pounds of wool a bath is prepared of 20 Aniline Colors. For this purpose the oxide quarts water, 3 ounces permanganate of of zinc, in accordance with a patent taken out potassa, 44 ounces sulphate of magnesia. in France by MM. Biot and Thisau, may be The use of sulphate of magnesia has for its used for mordanting aniline blue upon cotton, object, to prevent the formation of caustic or the iodine green upon wool. The mordant- alkali, and has already been proposed by ing is effected by simply immersing the goods Tessié du Mothay. The wool is impregnated for some hours in a bath of cold water, in with this solution, and left in it until the fluid which chloride or acetate of zinc has been dis- has become colorless, or nearly so, whereby it is colored dark-brown and covered with brown | 2577. To Dye Cotton Magenta. oxide of manganese. This process takes place Place the cotton in a bath of sumach (1 pound easily in the cold, but it is best to dissolve sumach to 10 pounds cotton) for 2 hours. the permanganate in hot water. The wool is Wring out, and dye in the same manner as now pressed out, and, without washing, con- wool. (See previous receipt.) A brighter veyed into a bath of 12 ounces commercial shade is given by dissolving 1/2 ounce soap in aniline oil, 21 ounces commercial hydrochloric hot water, letting the solution cool to 90°, acid, and 8 quarts water, where it is moved adding 2½ ounces olive oil, and mixing with about in the cold; it attains here directly a tepid water. In this 5 pounds of cotton may dark green-black color. It is pressed out be worked for about 5 minutes. A bath conagain, washed in water containing a little taining + pound sumach and 1 ounce tin soda, and treated with a weak solution of crystals is next prepared, through which the 1/80 ounce bichromate of potassa in 10 quarts cotton should be passed, wrung out, and water. The color becomes now dark black, finally dyed in a bath of magenta and puro when the wool is washed with water and water. dried.

2574. Persoz's Aniline Black for Wool or Silk. Steep the silk or wool for 1 hour at a boiling heat, in a bath consisting of 5 grammes (77 grains) bichromate of potassa, 3 grammes (46 grains) sulphate of copper, and 2 grammes (31 grains) oil of vitriol, for each litre (21 pints) of water used. It is then thoroughly washed, and afterward passed through a solotion of oxalate of aniline marking 1° to 2° Baumé, in which it at once assumes a black color. In case the fabric contains a vegetable fibre, the first bath must be replaced by a series of baths resulting in chromate of lead. This is effected by succes-