(al-iz-a’-rin) The red coloring principle occuring in the madder plant, Rubia tinctorium, and in anthracene, a coal-tar product. It occurs in red prismatic crystals, readily soluble in ether and alcohol. The alizarins form a group of the anthracene colors. See Conspectus of Pigments under Pigment. A. Blue, a crystalline blue coloring matter formed by heating nitroalizarin in combination with H. 2 S0 4 and glycerin. A. Red, a pale flesh-color used in dyeing.
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