Dyeing: comprising the dyeing and bleaching of wool, silk, cotton, flax, hemp, china grass &c. . f dyestuffs, being communications from coaltar colour manufacturers. Here will be described only the general methods ofapplication of the different azo colours. Azo Oranges, Tropeolines, c&c, are not largely used forcotton dyeing, and in the majority of cases are utilisedsimply as impregnation colours. The cotton is previouslyboiled in a soap bath, then lifted, cooled, wrung, andworked in the dyebath, which is made rather concentratedwith the addition of a little alum. Azo Scarlets (Ponceaux). Mord
Dyeing: comprising the dyeing and bleaching of wool, silk, cotton, flax, hemp, china grass &c. . f dyestuffs, being communications from coaltar colour manufacturers. Here will be described only the general methods ofapplication of the different azo colours. Azo Oranges, Tropeolines, c&c, are not largely used forcotton dyeing, and in the majority of cases are utilisedsimply as impregnation colours. The cotton is previouslyboiled in a soap bath, then lifted, cooled, wrung, andworked in the dyebath, which is made rather concentratedwith the addition of a little alum. Azo Scarlets (Ponceaux). Mordant—201b3. soda tartar in sufficient water, aliow to settle, draw off clearliquor, and make up to 70 Tw. Work cotton in this bathcold ; lift, wring out; dye in very concentrated bath of thedyestuff, at about GO C. Another method— 1st.—Work in stannic chloride solution at o Tw. forhalf-an-hour, wring. 2nd.—Work half-an-hour in second bath, with acetate ofalumina, 5 Tw.; wring, wash slightly. 3rd.—Dye in concentrated bath at about 60 PLATE XII.—ROBERTSHAWS DYEING MACHINE. PRACTICAL PROCESSES. 71 NEW CLASS OF AZO COLOURS. Congo Class.—These products, which come on themarket in such a variety of shade, and which are veryinteresting, as being the only class of coal tar coloursdyeing cotton without mordants, are applied on cottongenerally in an alkaline bath. The following recipes aredue to the kindness of Messrs. Bryce and Rumpf, theManchester agents of the Bayer Colour Works, Elberfeld,who have given special attention to these dyestuffs, with the exception of chrysamine yellow,which is fast, do not stand light so well as might bewished; but they are found very useful for a variety ofpurposes. The most interesting property of the coloursproduced on the fibre is that they stand soaping, and inmany cases boiling soap exceedingly well. They dye cotton, wool, silk, jute, linen, half-silken, half-woollen, half-l
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdyesanddyeing, bookye
