. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . ess may be carried out in an apparatus, a cross sec-tion of which is shown in Fig. 73. The beta naphthol preparedcloth is passed through the color box A, into which the cold diazosolution is constantly fed, then between a pair of squeeze passing, a short distance through the air in order that thecolor may fully develop, the cloth passes through the spray washerB, the soap bath C, and the fina
. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . ess may be carried out in an apparatus, a cross sec-tion of which is shown in Fig. 73. The beta naphthol preparedcloth is passed through the color box A, into which the cold diazosolution is constantly fed, then between a pair of squeeze passing, a short distance through the air in order that thecolor may fully develop, the cloth passes through the spray washerB, the soap bath C, and the final rinsing box D, when it is readyto be dried and finished. 210. Properties of Para Nitraniline and Alpha Naphthy=lamine Reds. Para Nitraniline lied on cotton is much fasterthan any of the direct cotton reds of siinilar character; and as re-gards fastness to light is excelled only by Turkey-red. Para redis much faster to the action of chlorine than Turkey-red, but notas fast to boiling alkaline solutions, or steaminof. Para red isaffected by boiling with acids, and the action of copper saltschanges it to a tobacco brown. It has the advantage of being 211 202 TEXTILE CHEMISTEY AND DYEING. TEXTILE CHEMISTRY AND DYEING 203 much cheaper to produce than Turkey-red and also of penetratingthe material more thoroughly. Like Turkey-red, para red is notextremely fast to rubbing. What has been said in regard to para red is in general truein regard to alpha naphthylamine red. REDUCTION VAT COLORS. 211, General Consideration. Three dyestuffs of import-ance are included under this heading: Indigo, ludauthreue, Flavauthreue. These dyestuffs are all insoluble in water, but upon reductionin alkaline solutions are converted into solublj compounds, inwhich form they may be applied to cotton r^aterial. Upon ex-posure of the nuiterial to the air, oxidation takes place and theoriginal insoluble compounds are formed, which became perma-nently fixed upon the fiber, 212, Indigo. This has already been co
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