Definition of bone black
: the black residue chiefly of tribasic calcium phosphate and carbon from bones calcined in closed vessels used especially as a pigment or as a decolorizing adsorbent in sugar manufacturing
— called also bone char
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“Bone black.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bone%20black. Accessed 18 Oct. 2021.
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Time Traveler for bone black
The first known use of bone black was circa 1735
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