Hummel, J. J. (John James), d. 1902 · London : Cassell · leaf 324
n of the hyposulphite being decomposed. When-ever the acid hyposulphite of soda has been drawn off,the zinc should be rinsed with water, and, if not im-mediately required again, the vessel should be filled upwith water, in order to prevent, as much as possible, theoxidation of the zinc. When a… … h<^^^WMfk:%i^^it^^M:^^!^^^.<^MS^<^ Fig. 84.—Apparatus for Prep.iringHjdrosulphite Vat Liquor. Chap. XIII.! INDIGO. 311 dissolved in the previous operation is replaced by anaddition of fresh zinc-foil, so that the vessel may beentirely full. Bisulphite of soda solution is then pouredover…
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