| 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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| nigrosine | <chemistry> A dark blue dyestuff, of the induline group. Synonym: azodiphenyl blue. Origin: From L. Niger black. Source: Websters Dictionary (01 Mar 1998) |