adapted for “running down" than all other kinds; but those made from thin " olein " will not bear more than half the prescribed proportion of rosin soap. CHAPTER XI. CRYSTALLISED GLYCERIN SOAP. THIS formula was suggested by the “Solidified Glycerin" of Price's Candle Company, Limited, a hard transparent soap of great emolliency, but so very hygroscopic that it becomes very wet upon short exposure. It is, therefore, sent to market in envelopes of tinfoil. This soap is composed, according to my analysis, of There is, therefore, the ratio of 1485 caustic soda to 100 of oil, or an excess of 485; notwithstanding which the soap is practically free from all harshness. It does not, however, give a very rich lather, nor is it very emollient. I have not been able to produce this soap of the composition above noted; but a superior article, with less glycerin and at less cost, may be made by my system, as follows. It is an error to suppose that the emolliency of a soap will increase with the proportion of glycerin which may be put into it. On the contrary, glycerin itself, unless largely and skilfully tempered by proper associates, is more or less harsh to the skin. This is confirmed by the use of pure glycerin alone as a cosmetic, for a few weeks continuously. Put into the pan 350 pounds of hot-pressed fat-acid cake (white), 150 pounds of inodorous light-coloured oleic acid, and 200 pounds of the whitest and best rosin. Heat to 300°— 310° Fahr., stir for three to five minutes, and then let in a boiling solution of 135 pounds of Jarrow carbonated ash water, at rapid flow. (52°) in 25 gallons of Continue the heating and stirring until the paste becomes perfectly homogeneous, or, in other words, about an hour, and then shut off the heat. At this stage, and while the stirring is continued, add 250 pounds of Price's or Sarg's pure glycerin. Take out half of the contents of the pan, and allow it to cool. If it is then transparent the soap is completed; otherwise it must be returned to the pan, and further treated with 125 pounds of glycerin in addition. The heating and stirring must now be regulated with great care, for sometimes the desired transparency is obtained by the stirring alone, and without further heating. The better way to insure success and save possible waste of glycerin will be to take trysamples of about two pounds each from the foundation paste, and pre-treat them over |