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A material used for dyeing.

A fast dyestuff, C20H8O6, made by heating gallein with strong sulphuric acid. It dyes mordanted fabrics green.

The root of the Oldenlandia umbellata, native in India, which yieds a durable red dyestuff. [Written also choy root.]

An orange-colored dyestuff, of artificial production.

An artificial, yellow, crystalline dye, C6H5N2.C6H3(NH2)2. Also, one of a group of dyestuffs resembling chrysoïdine proper.

A dyestuff consisting of the dried bodies of females of the Coccus cacti, an insect native in Mexico, Central America, etc., and found on several species of cactus, esp. Opuntia cochinellifera.

A yellow coal-tar dyestuff which probably consists chiefly of rosolic acid. See Aurin, and Rosolic acid under Rosolic. Red corallin, a red dyestuff which is obtained by treating aurin or rosolic acid with ammonia; -- called also pæonin. -- Yellow corallin. See Aurin.

A name given to any one of several yellow or scarlet dyestuffs of artificial production and complex structure. In general they are diazo and sulphonic acid derivatives of benzene and naphthol.

A dyestuff, obtained from the Chinese croicin, which produces a brilliant yellow.

To stain; to color; to give a new and permanent color to, as by the application of dyestuffs. Cloth to be dyed of divers colors. Trench. The soul is dyed by its thoughts. Lubbock. To dye in the grain, To dye in the wool (Fig.), to dye firmly; to imbue thoroughly. He might truly be termed a legitimate son of the revenue…

A green compound used as a dyestuff, produced from aniline blue when acted upon by acid.

A yellow or brownish red dyestuff obtained by the action of bromine on fluoresceïn, and named from the fine rose-red which it imparts to silk. It is also used for making a fine red ink. Its solution is fluorescent.

A red dyestuff obtained from fluoresceïn by the action of iodine.

A yellow, crystalline, organic dyestuff, C16H14N2, of artifical production. It is a strong base, and is a complex derivative of aniline and quinoline.

A yellow, vegetable dyestuff, resembling quercitron.

A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; -- called also rhamnoxanthin.

ed. (b) The glossy surface produced by the application of the above. -- French purple, a dyestuff obtained from lichens and used for coloring woolen and silken fabrics, without the aid of mordants. Ure. -- French red rouge. -- French rice, amelcorn. -- French roof (Arch.), a modified form of mansard roof having a n…

Aniline red; an artificial coal-tar dyestuff, of a metallic green color superficially, resembling cantharides, but when dissolved forming a brilliant dark red. It consists of a hydrochloride or acetate of rosaniline. See Rosaniline.

A red crystalline dyestuff, obtained by heating together pyrogallic and phthalic acids.

tially of a basic hydrate of chromium. -- Methyl green (Chem.), an artificial rosaniline dyestuff, obtained as a green substance having a brilliant yellow luster; -- called also light-green. -- Mineral green. See under Mineral. -- Mountain green. See Green earth, under Green, a. -- Paris green (Chem.), a poisonous…