The coal tar colours of Farbwerke vorm. Meister, Lucius & Brüning, Hoechst on Main, Germany, and their application in wool dyeing (1910)
Farbwerke vorm. Meister Lucius & Brüning · New York, H. A. Metz · leaf 111
r if the hydrosulphite is not evenly removed fromthe pieces, lighter places and imperfect penetration will ultimately result. In such cases, thepieces are repeatedly plaited down after squeezing, and finally oxidised by immersion in coldwater; somewhat less bloomy shades result by this method, but… … If it is desired to produce pure Indigo shades on piece goods, the vat is made up tothe necessary strength, and the goods left in the vat as described, until the desired shade isobtained. For works dealing with larger quantities, it is advisable to dye the pieces almostto shade in one or two…
Dyes and dyeing
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