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 for Charcoal blacks
From The Collaborative International Dictionary of English v.0.48 :

  Charcoal \Char"coal`\, n. [See Char, v. t., to burn or to
     reduce to coal, and Coal.]
     1. Impure carbon prepared from vegetable or animal
        substances; esp., coal made by charring wood in a kiln,
        retort, etc., from which air is excluded. It is used for
        fuel and in various mechanical, artistic, and chemical
        [1913 Webster]
     2. (Fine Arts) Finely prepared charcoal in small sticks, used
        as a drawing implement.
        [1913 Webster]
     Animal charcoal, a fine charcoal prepared by calcining
        bones in a closed vessel; -- used as a filtering agent in
        sugar refining, and as an absorbent and disinfectant.
     Charcoal blacks, the black pigment, consisting of burnt
        ivory, bone, cock, peach stones, and other substances.
     Charcoal drawing (Fine Arts), a drawing made with charcoal.
        See Charcoal, 2. Until within a few years this material
        has been used almost exclusively for preliminary outline,
        etc., but at present many finished drawings are made with
     Charcoal point, a carbon pencil prepared for use in an
        electric light apparatus.
     Mineral charcoal, a term applied to silky fibrous layers of
        charcoal, interlaminated in beds of ordinary bituminous
        coal; -- known to miners as mother of coal.
        [1913 Webster] charcoal-gray

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