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The madder of the Levant. Brande & C.

A coloring principle, C14H6O2(OH)2, found in madder, and now produced artificially from anthracene. It produces the Turkish reds.

stages of the distillation of coal tar. Its chief use is in the artificial production of alizarin. [Written also anthracin.]

a) of the buckthorn. Frangulinic acid (Chem.), a yellow crystalline substance, resembling alizarin, and obtained by the decomposition of frangulin.

An extract of madder by sulphuric acid. It consists essentially of alizarin.

An orangered coloring substance resembling alizarin, found in the root of an East Indian species of madder (Rubia munjista).

A dyestuff, resembling alizarin, obtained from naphthoquinone as a red crystalline substance with a bright green, metallic luster; -- called also naphthalizarin.

A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.

O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.

A yellow crystalline substance produced artificially. It is isomeric with alizarin.

ting, an acid extracted from madder root. It is a yellow crystalline substance from which alizarin is obtained.

t with the natural articles when such occur; thus, artificial alcohol, urea, indigo blue, alizarin, etc., are made by synthesis.