. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . fats present may be, at the end of thelime boil they will have been converted into the lime soaps orsalts of the fatty acids they contain, and glycerine. (See OrganicChemistry.) Lime soaps are as insoluble in water as the fats from whichthey are derived and for this reason they are not removed in thewashing that follows, but are still present on the cloth when itpasses to the brown sour. The question is
. Cyclopedia of textile work : a general reference library on cotton, woollen and worsted yarn manufacture, weaving, designing, chemistry and dyeing, finishing, knitting, and allied subjects . fats present may be, at the end of thelime boil they will have been converted into the lime soaps orsalts of the fatty acids they contain, and glycerine. (See OrganicChemistry.) Lime soaps are as insoluble in water as the fats from whichthey are derived and for this reason they are not removed in thewashing that follows, but are still present on the cloth when itpasses to the brown sour. The question is often raised: why not omit the lime boil andsaponify directly with caustic soda or soda ash (See No. 105) thusproducing a soluble soda soap that can be immediately washedfrom the cloth? This is done with much success in the Matherkier process (See No. 120) but experience and experiment haveshown that calcium hydroxide at a boiling temperature andunder pressure attacks the fatty matter (but more particularlythe cotton wax and resinous matter present) more energeticallyeven than caustic soda. At the same time lime is very cheap. M. Albert Scheurer who has made a thorough investigation 90. TEXTILE CHEMISTRY AND DYEING. 81 of the subject says, It has been shown that at 120 C, the natu-ral fats of cotton are saponified in less than two hours by the limeboil, and tallow in four hours. This is remarkable since causticsoda and rosin at the same temperature require eight hours. In
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