Catalogue . tion of acid dyes to cotton, wool, andsilk, under best conditions, is followed by a study of the fast-ness of the dyed fibres to light, washing, milling, water, per-spiration, carbonizing, cross dyeing, stoving, chloring andcrooking. Basic dyes are then taken up with their applicationto cotton, wool, and silk. The various tests for fastness arethen taken up and compared with the results obtained fromthe acid dyes. The dyeing of cotton with substantive dyesand the effect of aftertreating with chrome, bluestone, andshading with basic dyes is likewise followed by the comparisonwith ac
Catalogue . tion of acid dyes to cotton, wool, andsilk, under best conditions, is followed by a study of the fast-ness of the dyed fibres to light, washing, milling, water, per-spiration, carbonizing, cross dyeing, stoving, chloring andcrooking. Basic dyes are then taken up with their applicationto cotton, wool, and silk. The various tests for fastness arethen taken up and compared with the results obtained fromthe acid dyes. The dyeing of cotton with substantive dyesand the effect of aftertreating with chrome, bluestone, andshading with basic dyes is likewise followed by the comparisonwith acid, and basic dyes. The work of this term is completedby a study of the sulphur, developed, and mordant to this course of laboratory work runs a series oflectures treating on the bleaching, dyeing, and finishing ofpiece goods. Text Book:—Matthews Manual of Dyeing. 223. Dyeing. The work of this term is a continuation of that of the pre-vious term and starts by treating of logwood, and then the. 51 minor natural dyes. Indigo, which is now manufactured on alarge scale by synthetic methods, and the various so-called vatdyes, as the indanthene, ciba, algol, thio-indigo, etc., arestudied very fully and exhaustively. Having now covered theapplication of the dye-stuffs to the various fibres, the studenttakes up the method of testing the dye-stuff to determine itsmoney value, whether simple dye or a mixture, whether acidor basic, adulteration present, and the identification of specificdye-stuffs by their various chemical reactions. Tests are ap-plied to determine the amount of dye-stuff necessary for a fullshade, the proper amount of mordant, and the degree of ex-haustion of the bath. Matching to shade and the effect ofthe dichroic properties of various dye-stuffs on the shade pro-duced is taken up. At this point a general review of thesubject is taken up covering all the previous work done inthe course. The terms work is completed by the study of themethods of determini
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