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To Bleach Palm Oil

Dissolve+ pound powdered red chromate of potassa in about a quart hot water. 100 pounds palm oil are heated in a wooden tank, by steam, to a temperature of 120° Fahr. The steam is then turned off and a portion of the chrome solution is stirred in, followed by a proportional quantity of 1 poundstrong muriatic acid. After the whole of the solution and of the acid has been thoroughly mixed with the palm oil, stir in 1/4 pound sulphuric acid. The 533. To Purify Tallow and Other oil becomes black, then dark green, and finally Fats. Tallow and other fats are commonly light green, with a thick froth on the surface. purified by melting them along with water, If, when the mixture has settled, the oil is not passing the mixed fluids through a sieve, and sufficiently bleached, the operation has to be letting the whole cool slowly, when a cake of repeated, using less proportion of chrome cleansed fat is obtained. Another plan is to and acids. When the bleaching is complete, keep the tallow melted for some time, along the oil is allowed to stand for an hour to clear; with about 2 per cent. of oil of vitriol largely it is then run into a wooden tank with some diluted with water, employing constant agita- water, and heated again, to wash out any salts tion, and allowing the whole to cool slowly; that may remain in it, and after a time drawn then to re-melt the cake with a large quantity off ready for use. Palm oil is usually comof hot water, and to wash it well. Another bined with from 3 to 5 times its weight of talmethod is to blow steam for some time through low to make scap, and is serviceable in resin the melted fat. By either this or the prece- soap to brighten its color and disguise the ding process a white hard tallow may be obtained. Some persons add a little nitre to the melted fat, and afterwards a little dilute nitric or sulphuric acid, or a solution of bisulphate of potash. Others boil the fat along with water and a little dilute nitric or chromic acid, and afterwards wash it well with water. resin.