from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a class of dyes, varying from blue to black, used in the manufacture of inks and for dyeing wood and textiles.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A dark blue synthetic dyestuff of the induline group.

from the GNU version of the Collaborative International Dictionary of English

  • n. A dark blue dyestuff, of the induline group; -- called also azodiphenyl blue.

from The Century Dictionary and Cyclopedia

  • n. A coal-tar color used in dyeing, prepared from the hydrochlorid of violaniline.
  • n. The name is applied to three different coal-tar colors:
  • n. Spirit-soluble nigrosine, which is closely allied to spirit-soluble induliue.
  • n. Water-soluble nigrosine, which is the sodium salt of certain snlphonic acids of spirit-soluble nigrosine.
  • n. Methylene gray (which see, under gray).


Latin niger, nigr-, black; + -os(e)2 + -ine2.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin niger, "black". (Wiktionary)


  • Experimentations in 1878 with the insoluble aniline blacks and vanadium were unsuccessful; but the soluble aniline black (blue-black) known as nigrosine they used and still use in various combinations.

    Forty Centuries of Ink

  • Such inks are made from a fine, cheap powder, of which nigrosine is used in making black inks, eosine for red, and methylene for blue ink, and they cost only a few dimes a gallon to manufacture.

    Forty Centuries of Ink


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