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A trade name for a dyestuff, consisting essentially of impure fuchsine.

An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange.

The leaves of the henna plant, or a preparation or dyestuff made from them.

A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper-violet luster when rubbed. Indigo does not exist in the plants as s…

Any one of a series of artificial blue dyestuffs, resembling indigo in appearance, and obtained by the action of phenol on certain nitrogenous derivatives of quinone. Simple indophenol proper has not yet been isolated.

A dark green amorphous dyestuff, produced by the oxidation of aniline in the presence of copper or vanadium salts; -- called also aniline black.

A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.

A yellow dyestuff obtained from the foliage of the dyer's broom (Reseda luteola).

Designating an orange-red dyestuff obtained from naphthylamine, and called magdala red, naphthalene red, etc.

language of educated people in China. -- Mandarin yellow (Chem.), an artificial aniline dyestuff used for coloring silk and wool, and regarded as a complex derivative of quinoline.

A color of a delicate purple, violet, or lilac. Mauve aniline (Chem.), a dyestuff produced artificially by the oxidation of commercial aniline, and the first discovered of the so-called coal- tar, or aniline, dyes. It consists of the sulphate of mauveïne, and is a dark brown or bronze amorphous powder, which dissolves…

anic base, obtained by oxidizing a mixture of aniline and toluidine, and valuable for the dyestuffs it forms. [Written also mauvine.]

e bromide, CH2Br2; -- formerly called also methene. Methylene blue (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.

A yellow dyestuff extracted from the root bark of an East Indian plant (Morinda citrifolia).

ves among organic compounds. Formerly called also naphthaline. Naphthalene red (Chem.), a dyestuff obtained from certain diazo derivatives of naphthylamine, and called also magdala red. -- Naphthalene yellow (Chem.), a yellow dyestuff obtained from certain nitro derivatives of naphthol.

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

henol (carbolic) odor. Naphthol blue, Naphthol orange, Naphthol yellow (Chem.), brilliant dyestuffs produced from certain complex nitrogenous derivatives of naphthol or naphthoquinone.

The complex, nitrogenous, organic base and dyestuff called also aniline black.

A dark blue dyestuff, of the induline group; -- called also azodiphenyl blue.

A reddish brown amorphous dyestuff,