Crossword Genius

Black carbon residue from heating various substances without air (8)

Ross

I believe the answer is:

charcoal

(Other definitions for charcoal that I've seen before include "Black stuff for burning or drawing" , "Kind of fuel made by burning wood" , "Black residue of burnt wood" , "Form of carbon for drawing" , "Black carbon produced by burning wood" .)

I've seen this clue in the Sydney Morning Herald.
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