Page:Treatise on Soap Making.djvu/83

67 soap, on the contrary, retains the whole leys used in the making thereof; becoming, with the other materials employed, one compound body, called, soft soap. A few examples will clearly explain the nature and practical means made use of in producing this very useful soap.

The fundamental principle upon which the proper management, or manufacturing, of soft soap depends, as we have before stated for hard soap, is a certain knowledge of the quality and strength of the leys; for however necessary that knowledge may be in hard soap-making, it is peculiarly more so in soft.

The using of leys below the proper strength alloted, will materially spoil the whole boiling, and occasion much additional trouble to the manufacturer, with a considerable loss of time, before a proper arrangement afterwards can be eftected, and