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Test for Benzole

For distinguishing genuine benzole, or that made of coal tar, from that prepared from petroleum, Brandberg recommends us to place a small piece of pitch in a testing tube, and pour color to a bottle green or brownish-green; amover it some of the substance to be examined. monia changes the color to brownish-green or The genuine will immediately dissolve the greenish-brown; a solution of alum to which pitch to a tar-like mass, while that derived some potash has been added gives a dirty from petroleum will scarcely be colored. (See Nos. 4320 and 4321.)