. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . hat is required is the separation of theblue from the excess of aniline. One method for attaining this object consistsin sweeping the aniline mechanically away by a current of steam. In theother method it is removed by washing with dilute acids. The residue is thenfit for sale. ig8 DYEING AND CALICO PRINTING. Refined Blues are obtained by various methods. The crude product is mixedwith alcohol, and poured in thin streams into water acidul
. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . hat is required is the separation of theblue from the excess of aniline. One method for attaining this object consistsin sweeping the aniline mechanically away by a current of steam. In theother method it is removed by washing with dilute acids. The residue is thenfit for sale. ig8 DYEING AND CALICO PRINTING. Refined Blues are obtained by various methods. The crude product is mixedwith alcohol, and poured in thin streams into water acidulated with hydro-chloric acid. There is formed a salt of aniline, which remains in solutionalong with any excess of unconverted rosaniline, and the blue is is then collected on a filter, and repeatedly washed with boiling acidulatedwater. Night blue, so called because it preserves its tone by artificial light, issimply a salt of triphenylic rosaniline, perfectly pure. To prepare it, therefined blue resulting from the last operation is repeatedly washed with coldalcohol, and then dissolved in boiling alcohol, after having been finely Fig. Apparatus for the Preparation of Aniline Retort of enamelled cast-iron, immersed in the oil-bath, b. c. Vertical shaft,carrying two agitators, the one d, a spiral, and the other fitted with wings parallelto the sides of the retort, and with teeth extending very nearly to the Cover fitted on to the retort by the pressure-screws, g, and carrying h, a stuffing-box for the shaft c; another, t, for the thermometer and a tubulure,;, communicatingat will by means of cocks with a worm, A, or a verm cohobator, k, and /. a tube forintroducing steam into the apparatus. The steam may be otherwise introduceJ byhaving a hollow shaft for the agitator in place of a solid one. Movement is givenby the pullies, m m, and the cog-wheels, n The mixture is then filtered, and mixed with an alcoholic solutionof caustic soda,
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectdyesanddyeing, bookye
