Crossword Genius

Combustion byproduct

Ross

I believe the answer is:

soot

'combustion byproduct' is the definition.
(I've seen this in another clue)

This is all the clue.

(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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