Marine Soap. - These soaps are so named because they are not insoluble in a strong solution of salt; hence they form a lather and can be used for washing with sea-water.
Natural razor strops, and the expressed juice of the leaves will lather in water like soap. In the Madras Presidency the plant is extensively used for hedges along railroads.
Soap containing small proportions of glycerin, on the other hand, forms a very tenacious lather, and when soap bubbles of an enduring character are desired glycerin is added to the solution.
Playfairii, when shaken with water forms a slight but permanent lather, and on this account is used by the Somali women for cleansing their hair, and by the men to whiten their shields; it is known as meena h¢rma in Bombay, and was formerly used there for the expulsion of the guinea-worm.