Nigrosin is a mixture of synthetic black dyes (CI 50415, Solvent black 5) made by heating a mixture of nitrobenzene, aniline and aniline hydrochloride in the presence of a copper or iron catalyst. Its main industrial uses are as a colorant for lacquers and varnishes and in marker-pen inks. Sulfonation of nigrosin yields a water soluble anionic dye...
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http://en.wikipedia.org/wiki/Nigrosin
Nigrosine ... A variable mixture of blue-black aniline dyes; used as a histologic stain for nervous tissue and as a negative stain for studying bacteria and spirochetes; also used to discriminate between live and dead cells in dye-exclusion staining. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: nī′grō-sin, -sēn Definitions: 1. A variable mixture of blue-black aniline dyes; used as a histologic stain for nervous tissue and as a negative stain for studying bacteria and spirochetes; also used to discriminate between live and dead cells in dye-exclusion staining.
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http://www.medilexicon.com/medicaldictionary.php?t=60483
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