Hummel, J. J. (John James), -1902, Foster, A. R, Hasluck, Paul N. (Paul Nooncree), 1854-1931 · Philadelphia : David McKay · leaf 24
OURING MATTERS FOR DYEING TEXTILES. It is not customary to reduce the Indigo in each vat separately, but rather to make a very concentrated solu- tion of reduced Indigo, and to use this stock solution for preparing and replenishing the dye-vats. The setting of a hydrosulphite vat naturally divides… … Fig. i. — Apparatus for Preparing Hydrosulphite Vat Liquor. 3. The mixing of this solution with Indigo and a further quantity of lime, in order to produce the stock solution of reduced Indigo. Fig. 4 shows a suitable ap- paratus in which to conduct the first two operations. (1.) A vessel a,…
Dyes and dyeing · Coloring matter
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from One thousand processes in manufactures and experiments in chemistry / [Colin Mackenzie]. (1825)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b29307867-354-1.webp)
