Grocers' Goods / A Family Guide to the Purchase of Flour, Sugar, Tea, Coffee, Spices, Canned Goods, Cigars, Wines, and All Other Articles Usually Found in American Grocery Stores

by Frederick B. Goddard

SOAP.

Soap is made by boiling down oils or fats in a water solution of caustic soda or potash. Through the acid properties of the fats, the oleine, stearine, margarine, etc., which they contain, combine with the alkali to produce the saponified compound.

Hard soap is made with soda; soft soap with potash. The more oleine in the fat, the softer the soap; the more stearine the harder. Rosin is also largely used, sometimes to the extent of one-third the weight of the soap. It increases its hardness, makes it dissolve easier in water and forms a more copious lather.