Combustion byproducts such as char, ash, and soot (also referred to as carbon black) are the residues left behind after the burning of organic materials. These byproducts vary in composition and structure depending on the combustion process and material source. Char is a carbon-rich material that forms under limited oxygen conditions, while ash is the mineral residue left after complete combustion. Soot or carbon black consists of fine carbon particles formed during incomplete combustion.