Sooting is a term used to describe the action of producing soot, or the black carbonaceous substance that results from incomplete combustion. Synonyms for sooting include blackening, smudging, darkening, staining, charred, marking, dirtying, sullying, and polluting. These words describe the discoloration of an object or surface due to the presence of soot. In addition, related words include ash, cinder, grime, smoke, and filth. Sooting is most commonly associated with fireplaces, candles, and other sources of open flame, but can also be a result of cooking or industrial processes.