Crossword Genius

Combustion byproduct (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">combustion byproduct</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for soot that I've seen before include "Carbon black" , "Carbon dust from fire" , "Deposited carbon" , "Smut" , "Black chimney powder" .)

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