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To Make Soft Soap Hard

Put contains in solution the fatty acids, while the into two distinct layers, the upper of which into a kettle 4 pailfuls of soft soap, and stir in lower layer contains the alkalies and salts, it, by degrees, about 1 quart of common salt. and such substances as might happen to be Boil until all the water is separated from the insoluble in the two fluids just named. By curd, remove the fire from the kettle, and draw off the water with a syphon (a yard or from each other. The ethereal solution is means of a pipette, the fluids are separated so of india rubber hose will answer). Then poured into a previously weighed beaker glass, pour the soap into a wooden form in which and the ether evaporated upon a water bath, muslin has been placed. (See No. 549.) For and next again weighed with the fatty acids this purpose, a wooden box, sufficiently large it contains. and tight, may be employed. When the soap evaporated to dryness, and the quantity of The aqueous acetic acid is is firm, turn it out to dry, cut into bars with a alkali determined according to well-known brass wire and let it harden.

A little methods. (See No. 586). powdered resin will assist the soap to harden, and give it a yellow color. If the soft soap is very thin, more salt must be used. 621. Analysis of Soda and Potassa Lyes. The following tables will show at a glance all the practical information necessary either simple or caustic, as well as affording for analyzing or testing the strength of lyes, thorough guidance in mixing or adjusting the strength of lye for any specific purpose.