noun (n)

• a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink(noun.substance)

  Synonym:
  carbon black, crock, smut, soot
  

  source: wordnet30
• The fine impalpable soot obtained from the smoke of carbonaceous substances which have been only partly burnt, as in the flame of a smoking lamp. It consists of finely divided carbon, with sometimes a very small proportion of various impurities. It is used as an ingredient of printers' ink, and various black pigments and cements.(noun)

  source: webster1913