ANILINE BLACK.

647

of hydrochloric acid of commerce, and 1 pint of hypochlorite of lime insolution containing 1 lb. of hypochlorite of lime to the gallon. I keep thegoods in this solution for from twenty to thirty minutes, or until the woolbecomes quite yellow ; I then wash well in water, and dry. The chlorodisingor oxidising sufficient for ordinary colours is not applicable to aniline black,and a point of oxidisation or chlorodising is required which would not beadvisable to give to fabrics intended for ordinary colours. In dyeing coburgsand similar goods the present processes involve two operations. I avoid thistwice dyeing by preparing the mixture of cotton, wool, silk, or other animalsubstance, as above, so that they will both take a black dye at one and thesame time. I steep or pad the goods, either before or after drying, in thefollowing dye:—1 gallon of water, 4 ounces chlorate of potash, 12 ounceschloride of aniline crystals, 6 ounces sal-ammoniac, 2 ounces sulphate ofcopper. I then dry the goods at as low a heat as possible, and age for two orthree nights in a moist room at from 76° to 8o° F., and when the colour is

Aniline-Black, with Madder-Red and Chrome-Orange.

thoroughly developed it becomes an intense myrtle-green, almost black. Iraise the goods either in water or any weak alkali, or in a weak cold solutionof neutral chromate of potash, which I use in preference; and if a brownish-black is required, the goods may be subsequently dyed in a weak hot solutionof orchil or cudbear. When the prepared cloth is used for printing, I print onthe aniline black colour, as described in the Specification of my former Patentalready referred to, and dry and age in a warm moist room, and raise in weakalkali as before. I then pass the goods through a warm solution of sulphiteor hyposulphite of soda, or a solution of any suitable deoxidising agent, toimprove the whites; or the goods maybe passed through Mr. Thom’s sul-phuring apparatus. It is preferable after sulphuring to repass the goodsthrough a weak alkali.”

The above pattern, printed by the late Mr. J. Lightfoot, of Accrington, isan interesting specimen of the effe&s produced by combining aniline black