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A variety of tourmaline of an indigo-blue color.

A dark red crystalline substance, isomeric with and resembling indigo blue, and obtained from isatide and dioxindol.

A substance isomeric with, and resembling, indigo blue, and accompanying it as a side product, in its artificial production.

ement, discovered in certain ores of zinc, by means of its characteristic spectrum of two indigo blue lines; hence, its name. In appearance it resembles zinc, being white or lead gray, soft, malleable and easily fusible, but in its chemical relation it resembles aluminium or gallium. Symbol In. Atomic weight, 113.4.…

Any one of a series of artificial blue dyes, in appearance resembling indigo, for which they are often used as substitutes.

A complex, nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo.

A substance resembling indigo blue, obtained artificially from certain isatogen compounds.

A white, crystalline substance, C8H7N, obtained from blue indigo, and almost all indigo derivatives, by a process of reduction. It is also formed from albuminous matter, together with skatol, by putrefaction, and by fusion with caustic potash, and is present in human excrement, as well as in the intestinal canal of som…

A dark resinous substance, polymeric with indol, and obtained by the reduction of indigo white.

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.

An orange-red crystalline substance, C8H5NO2, obtained by the oxidation of indigo blue. It is also produced from certain derivatives of benzoic acid, and is one important source of artificial indigo. [Written also, less properly, isatine.]

erbs, some species of which, especially the Isatis tinctoria, yield a blue dye similar to indigo; woad.

al residue of a series of compounds, related to isatin, which easily pass by reduction to indigo blue. -- I*sat`o*gen"ic, a.

A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.

al species of which furnish valuable fiber, and one species (Marsdenia tinctoria) affords indigo.

or radical. -- Neutral tint, a bluish gray pigment, used in water colors, made by mixing indigo or other blue some warm color. the shades vary greatly. -- Neutral vowel, the vowel element having an obscure and indefinite quality, such as is commonly taken by the vowel in many unaccented syllables. It is regarded by s…

It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing. Our orpiment and sublimed mercurie. Chaucer. Red orpiment, realgar; the red sulphide of arsenic. -- Yellow orpiment, king's yellow.

smuth subchloride; - - used chiefly as a cosmetic. (b) A variety of white lead blued with indigo or Berlin blue.

A purple powder precipitated when a sulphuric solution of indigo is diluted with water.

less, thick, oily liquid, H2S2O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.