A Black Substance That Comes From Burning Wood. What is a black substance that comes out of burning wood? Soot is formed in a temperature lower than 284 degrees.
Hence it can be correctly referred to as the byproduct of fireplace combustion. Soot is formed in a temperature lower than 284 degrees. Chimney soot is fine black or dark brown powder formed due to incomplete combustion of wood or coal in a confined place.
