- Congo dye
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n.any of certain azo dyes, derived mainly from benzidine
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Universalium. 2010.
Congo dye
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Congo dye — or Congo color n. any of certain azo dyes, derived mainly from benzidine … English World dictionary
congo dye — noun Usage: usually capitalized C : any of a group of direct azo dyes most of which are derivatives of benzidine see dye table I * * * Congo color or Congo dye, any one of a group of direct azo dyes, usually derived from benzidine … Useful english dictionary
Congo color — Chem. any of a group of azo dyes derived from benzidine that will dye cotton and other vegetable fibers without the aid of a mordant. Also called Congo dye. * * * Congo color or Congo dye, any one of a group of direct azo dyes, usually derived… … Useful english dictionary
Congo color — Chem. any of a group of azo dyes derived from benzidine that will dye cotton and other vegetable fibers without the aid of a mordant. Also called Congo dye. * * * … Universalium
Congo red — IUPAC name sodium sodium 3,3 ([1,1 biphenyl] 4,4 diyl)bis(4 aminonaphthalene 1 sulfonate) … Wikipedia
Congo paper — Congo red Congo red (Chem.) An artificial red dye from which the Congo group received its name. It is also widely used either in aqueous solution or as test paper ( {Congo paper}) for the detection of free acid, which turns it blue. [Webster 1913 … The Collaborative International Dictionary of English
Congo red — (Chem.) An artificial red dye from which the Congo group received its name. It is also widely used either in aqueous solution or as test paper ( {Congo paper}) for the detection of free acid, which turns it blue. [Webster 1913 Suppl.] … The Collaborative International Dictionary of English
dye — dyable, dyeable, adj. dyer, n. /duy/, n., v., dyed, dyeing. n. 1. a coloring material or matter. 2. a liquid containing coloring matter, for imparting a particular hue to cloth, paper, etc. 3. color or hue, esp. as produced by dyeing. 4. of the… … Universalium
Congo red — Chem. a water soluble powder, C32H22O6N6S2Na2, one of the Congo colors that is not acid fast or lightfast: used chiefly as a dye, biological stain, and chemical indicator. [1880 85] * * * ▪ dyestuff first of the synthetic dyestuffs of the… … Universalium
Congo red — An acid direct cotton dye, it is absorbed by amyloid and induces green fluorescence to amyloid in polarized light; used as a laboratory aid in the diagnosis of amyloidosis, as a histologic stain, and as an … Medical dictionary
