The Collaborative International Dictionary
Boneblack
Boneblack \Bone"black`\, n. See Bone black, under Bone, n.
Wiktionary
boneblack
n. A preparation containing carbonized bone, used as a pigment and a filtering medium.
Usage examples of "boneblack".
The feathers were white, but those false Indians were supposed to burn bones and stir the boneblack with their feathers to get them black.