Charcoal is the dark grey residue consisting of carbon, and any remaining ash, obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by slow pyrolysis, the heating of wood or other substances in the absence of oxygen (see pyrolysis, char and biochar). It is usually an impure form of carbon as it contains ash; however, sugar charcoal is among the purest forms of carbon readily available, particularly if it is not made by heating but by a dehydration reaction with sulfuric acid to minimise introducing new impurities, as impurities can be removed from the sugar in advance. The resulting soft, brittle, lightweight, black, porous material resembles coal.

Noun

charcoal (plural charcoals)

1. Impure carbon obtained by heating wood or other organic matter in the absence of oxygen.
2. A stick of black carbon material used for drawing.
   • 1879, Th Du Moncel, The Telephone, the Microphone and the Phonograph, page 166:

     He takes the prepared charcoal used by artists, brings it to a white heat, and suddenly plunges it in a bath of mercury, of which the globules instantly penetrate the pores of charcoal, and may be said to metallize it.

3. A drawing made with charcoal.
4. A very dark gray colour.

   charcoal colour:

charcoal

1. Of a dark gray colour.

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