We learn by the " Comptes Rendus," thai J. Cambaceres, has endeavored to get a useful product in the manufacture of fatty acids' into candles. Tallow in the manufacture ol stea-aric candles, is saponified with .lime, then the lime is separated from the fatty matter by sulphuric acid, which combines with the liiie, forming the sulphate of lime, and setting the fatty stearic acid free, thereby fitting it for bleaching, and being made into beautiful sperm-like candles. Instead of using lime to saponify the tallow, M. Cambasceres employs soda or potash ley, and adds clay. The soap containing an excess of the alkali acts upon the clay so as to dissolve the''alumina in it which combines with the fatty matter form, ing an insoluble aluminous soap. By the addition of sulphuric acid to this, the fatty matter* arc aefe free, and thti'roaticf; is fho'BjS-phate of lime, and when clay can be found, free from iron, and near a candle-factory, this process is worth a trial by some ol our spirited candle makers.
This article was originally published with the title "Alum Made in the Manufacture of Candles" in Scientific American 8, 37, 289 (May 1853)