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An artifical red nitrogenous dyestuff, called also red coralline.

talline substance, C6H4.(CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins.

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

varieties are known, a and g. g-pyrone is the parent substance of several natural yellow dyestuffs.

a pigment prepared by the Dutch, similar to Indian red. -- Hypericum red, a red resinous dyestuff extracted from Hypericum. -- Indian red. See under Indian, and Almagra.

a, etc., with caustic potash. It is also produced artificially and used in making certain dyestuffs, as phthaleïn, fluoresceïn, and eosin.

A red dyestuff, used as a substitute for cochineal, archil, etc. It consists of the sodium salt of a complex azo derivative of naphtol.

Pertaining to, or designating, a complex red dyestuff (called rosolic acid) which is analogous to rosaniline and aurin. It is produced by oxidizing a mixture of phenol and cresol, as a dark red amorphous mass, C20H16O3, which forms weak salts with bases, and stable ones with acids. Called also methyl aurin, and, former…

f anthracene obtained as a white crystalline substance, which on oxidation produces a red dyestuff related to anthraquinone.

An annual composite plant (Carthamus tinctorius), the flowers of which are used as a dyestuff and in making rouge; bastard, or false, saffron.

An orange-red dyestuff extracted from the saffron. [R.]

An orange-red nitrogenous dyestuff produced artificailly by oxidizing certain aniline derivatives, and used in dyeing silk and wool; also, any one of the series of which safranine proper is the type.

lum); -- used specifically to designate an acid obtained as a resinous or red crystalline dyestuff, which is called also santalin.

An artificial dyestuff obtained as an orange-yellow powder, and regarded as a phenyl hydrazine derivative of tartaric and sulphonic acids.

An artificial red or violet dyestuff consisting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet.

A red or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder.

A name given to any one of a series of orange-red dyestuffs produced artificially from certain complex sulphonic acid derivatives of azo and diazo hydrocarbons of the aromatic series; -- so called because of the general resemblance to the shades of nasturtium (Tropæolum).

A trade name for a brown dyestuff obtained from certain basic azo compounds of benzene; -- called also Bismarck brown, Manchester brown, etc.

A dyestuff of the induline group, made from aniline, and used as a substitute for indigo in dyeing wool and silk a violet-blue or a gray-blue color.

A blue dyestuff, or coloring matter, consisting of the powdered and fermented leaves of the Isatis tinctoria. It is now superseded by indigo, but is somewhat used with indigo as a ferment in dyeing. Their bodies . . . painted with woad in sundry figures. Milton. Wild woad (Bot.), the weld (Reseda luteola). See Weld. -…