File: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 (1907) (14770389704).jpg

Identifier: cyclopediaoftext06chic (find matches)
Title: 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
Year: 1907 (1900s)
Authors:
Subjects: Textile industry Textile fabrics
Publisher: Chicago : American school of correspondence
Contributing Library: Claire T. Carney Library, University of Massachusetts Dartmouth
Digitizing Sponsor: Claire T. Carney Library, University of Massachusetts Dartmouth

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
oduced (except withAlizarine and Alizarine Yellow upon aluminium or tin mordants)are of a dark and subdued character. Blacks, dark blues, darkgreens, browns, garnets, dull reds and compound shades of thesepredominate. In every case some metallic mordanting principle must be usedin conjunction with the dyestuff. The mordant may be appliedin three different ways. I. Previous to the dyeing.II. At the same time as the dyeing. III. After the dyestuff has been applied. The first method is by far the most important, the second be-ing applicable only with some of the natural mordant colors and 195 186 TEXTILE CHEMISTRY AND DYEING some alizarine reds and yellows. The third iiietliod is seldom ifever used for the true mordant colors, although extensively usedwith the mordant acid colors. Chromium mordants are used almost entirely, except for reds,pinks, and bright yellows, aluminium and sometimes tin mordantsbeing used for these. AYith some of the nitroso colors iron mor-dants are largelv used.
Text Appearing After Image:
Fig. 72. Scotch Dye Tub. The whole subject of mordants has been fully discussed, bothas to principle and methods of application, and the student is re-ferred at this time to Part III for details. The following generalstatement will therefore suffice. 196 TEXTILE CHEMISTRY AND DYEING 187 Mordanting Process. The wool, wliich should be wellscoured and washed, is mordanted by boiling from one to twohours, depending upon the nature of the material, in a bath con-taining the mordanting principle,* (usually potassium bichro-mate 1 to •!%) and some mordanting assistant, j- (usually potas-sium bitartrate or lactic acid 1^ to 3%) during which time thereis a gradual dissociation of the mordanting principle and slowdeposition of the mordant proper upon the fiber. Dyeing Process. The chromium mordanted material (wool fiber) is thoroughly washed and then dyed in a fresh bath. When possible the moi-danting material is not allowed to dry between the mordanting and dyeing. The dye bath is prepared w

Note About Images