Source : Webster's Revised Unabridged Dictionary (1913)

Lampblack \Lamp"black`\, n. [Lamp + black.]
   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.

Source : WordNet®

lampblack
     n : a black colloidal substance consisting wholly or principally
         of amorphous carbon and used to make pigments and ink
         [syn: {carbon black}, {soot}, {smut}]