Crossword Genius

Carbon black (4)

Ross

I believe the answer is:

soot

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">carbon black</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for soot that I've seen before include "Carbon dust from fire" , "Black chimney powder" , "Residue from burning" , "Something stuck down the chimney" , "Deposited carbon" .)

I've seen this clue in The Guardian.
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