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nigrosine

nigrosine Chem.
  (ˈnɪgrəsɪn)
  Also -in.
  [f. L. nigr- black + -ose + -ine5.]
  A blue-grey or blue-black colouring matter derived from aniline hydro-chlorate.

1892 in Syd. Soc. Lex. 1897 Westm. Gaz. 12 Aug. 2/3 One sample, made of nigrosine,..contained quantities of fungi. 1899 Allbutt's Syst. Med. VIII. 882 They stain well..with hæmatoxylin, congo-red, or acid nigrosin.

Oxford English Dictionary

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