noun, often capitalized
Ni·​gro·​sine | \ ˈnīgrəˌsēn, -sə̇n\
variants: or nigrosine or less commonly Nigrosin \ -​sə̇n \ or nigrosin
plural -s

Definition of Nigrosine

: any of several azine dyes closely related to the indulines: such as
a or Nigrosine Base B : an oil-soluble bluish black dye obtained as the free base by heating aniline and aniline hydrochloride and nitrobenzene or nitrophenol in the presence of iron and used chiefly in coloring waxes, shoe polish, plastics, and lacquers and as wood stains
b or Nigrosine Spirit Soluble : a chloride of the free base that is soluble in alcohol and is used similarly
c or Nigrosine Water Soluble : a water-soluble sulfonation product of the free base or of its chloride used chiefly in dyeing leather and paper and as a biological stain

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History and Etymology for Nigrosine

Latin nigr-, niger black + English -ose + -ine or -in

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