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Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents from animal and vegetation substances. It is usually produced by heating wood in the absence of oxygen (see char), but sugar charcoal, bone charcoal (which contains a great amount of calcium phosphate), and others can be produced as well. The soft, brittle, light, black, porous material resembles coal and is 85% to 98% carbon, the remainder consisting of volatile chemicals and ash.