A manual of dyeing: for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing (1919)
Knecht, Edmund, 1861-1925, Loewenthal, Richard, Rawson, Christopher · London : C. Griffin · leaf 360
usual in many works (especially in black dyeing) toboil the bags three times—i.e., in preparing the bath one bag is used containingfresh colouring matter, one which was imperfectly extracted in the operationbefore, and the third from the last operation but one (see p. 332). An ingenious device for… … Fig. 105.—Smithsons dyewood extractor (section). extracting vessels, F, constructed of cast iron, and provided with false bottoms,H, which are attached to the side of the dye-vessel, A. From a point a fewinches above the bottom of the dye-vessel there passes a pipe, B, which has athrough connection…
Dyes and dyeing
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