Bone black Meaning, Definition & Usage

  1. noun black substance containing char in the form of carbonized bone; used as a black pigment
    bone char; animal black; animal charcoal.

WordNet

Definitions
  1. (Chem.), the black, carbonaceous substance into which bones are converted by calcination in close vessels; called also animal charcoal. It is used as a decolorizing material in filtering sirups, extracts, etc., and as a black pigment. See Ivory black, under Black.

Webster 1913