Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) A dark blue dyestuff, of the induline group; -- called also azodiphenyl blue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[Latin niger, nigr-, black; see nekw-t- in Indo-European roots + –os(e) + –ine.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin niger, "black".

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Examples

  • 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 1904

  • 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 1904

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