Fraps, George Stronach, 1876- · New York Macmillan · leaf 125
cistern, andused again after its strength has been restored. Souring. — Sulphuric, hydrochloric, or acetic acid of fromI :o 2^ Tw. are used. The yarn is then carefully washed. … Fig. Bleaching under sieve. OPEIL\TIONS PRELIMINARY TO DYEING 109 Cop Bleaching. — In cop bleaching, the hot alkaline liquorand the cold bleaching liquors are forced through the copby apparatus described under cop dyeing. Sodium hypo-chlorite is usually used in place of calcium hypochlorite.…
Dyes and dyeing
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