Beech, Franklin · London, Scott, Greenwood, New York, Van Nostrand co · leaf 40
ofthe soap, by treatment with sulphuric acid. By subjectingthe grease or fatty matter so obtained to a boil with caustic PEOCESSES PREPARATORY TO DYEING. 29 soda soap is obtained which may be again used in scouringwool. Bleaching Wool.—The wool fibre has to be treated verydifferently from cotton… … Fig. 7.—Cloth-washing Machine. destroyed, so that the bleached cotton never regains itsoriginal colour, the same is not the case with wool,especially with sulphur-bleached wool, here the colouringmatter of the fibre is, as it were, only hidden, and willunder certain circumstances return. The two…
Dyes and dyeing -- Wool
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