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ral 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 such, but is obtained by decomposit…

minous plants having many species, mostly in tropical countries, several of them yielding indigo, esp. Indigofera tinctoria, and I. Anil.

See Indigo white, under Indigo.

An instrument for ascertaining the strength of an indigo solution, as in volumetric analysis. Ure.

The art or method of determining the coloring power of indigo.

Pertaining to, or derived from, indigo; as, indigotic acid, which is also called anilic or nitrosalicylic acid.

See Indigo blue, under Indigo.

rtaining to, or designating, a sulphonic acid obtained, as a blue solution, by dissolving indigo in sulphuric acid; -- formerly called also cerulic sulphuric acid, but properly called indigo-disulphonic acid.

A genus of leguminous shrubs, having long clusters of purple flowers; false or bastard indigo. Longfellow.

A West Indian plant (Indigofera anil), one of the original sources of indigo; also, the indigo dye.

Pertaining to, or obtained from, anil; indigotic; -- applied to an acid formed by the action of nitric acid on indigo. [R.]

replaced by the radical phenyl. It is a colorless, oily liquid, originally obtained from indigo by distillation, but now largely manufactured from coal tar or nitrobenzene as a base from which many brilliant dyes are made.

Something to give a bluish tint, as indigo, or preparations used by washerwomen.

A bale or package. covered with hide, or with wood bound with hide; as, a ceroon of indigo, cochineal, etc.

the consideration of some particular subject; as, the chemistry of iron; the chemistry of indigo.

ertain benzene derivatives in large quantities, and used for the artificial production of indigo.

A native sulphide of copper, occuring in masses of a dark blue color; -- hence called indigo copper.

ine nitrogenous substance or artificial production, which by reduction passes directly to indigo.

an plants Butea frondosa and B. superba, and used locally in tanning and in precipitating indigo. -- Gum cistus, a plant of the genus Cistus (Cistus ladaniferus), a species of rock rose.-- Gum dragon. See Tragacanth. -- Gum elastic, Elastic gum. See Caoutchouc. -- Gum elemi. See Elemi. -- Gum juniper. See Sandarac.…

A glucoside obtained from woad (indigo plant) and other plants, as a yellow or light brown sirup. It has a nauseous bitter taste, a decomposes or drying. By the action of acids, ferments, etc., it breaks down into sugar and indigo. It is the source of natural indigo.