benzidine

American  

[ben-zi-deen, -din] / ˈbɛn zɪˌdin, -dɪn /

noun

Chemistry.

1. a grayish, crystalline, slightly water-soluble, basic compound, C 12 H 12 N 2 , usually derived from nitrobenzene: used chiefly in the synthesis of certain azo dyes, especially Congo red.

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benzidine British  

/ ˈbɛnzɪˌdiːn, -dɪn /

noun

1. a grey or reddish poisonous crystalline powder that is used mainly in the manufacture of dyes, esp Congo red. Formula: NH 2 (C 6 H 4 ) 2 NH 2

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benzidine Scientific  

/ bĕn′zĭ-dēn′ /

1. A yellowish, white, or reddish-gray crystalline powder that is produced synthetically and is carcinogenic. It is used in making dyes, as a reagent, and in detecting blood stains. Chemical formula: C ₁₂ H ₁₂ N ₂ .

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Etymology

Origin of benzidine

First recorded in 1875–80; benz- + -id ³ + -ine ²

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Example Sentences

See Examples For:

benzidine

Among them: > The Labor Department's 1973 declaration of zero tolerance levels in industry for ten widely used chemicals, including benzidine and beta-naphthylamine.

From Time Magazine Archive

Beginning of manufacture of cotton azo-dyes, and leading to the production of benzidine and tolidine on a large scale.

From Coal and What We Get from It by Raphael Meldola

Thus diazotised benzidine and tolidine combine with salicylic acid to form valuable yellow azo-dyes known as “chrysamines.”

From Coal and What We Get from It by Raphael Meldola

In addition to benzidine and tolidine, other diazotisable amido-compounds have of late years been pressed into the service of the colour-manufacturer.

From Coal and What We Get from It by Raphael Meldola

Secondary azo-dyes from benzidine and tolidine containing two dissimilar amines, phenols, &c., introduced by Pfaff.

From Coal and What We Get from It by Raphael Meldola

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