Can be used like ammonium chloride for white smoke, however, it requires higher combustion heats because of its higher melting point (1429°F). Wikipedia; Along with sodium chloride and lithium chloride, potassium chloride is used as a flux for the gas welding of aluminum. Potassium chloride was once used as a fire extinguishing agent, used in portable and wheeled fire extinguishers. Known as Super-K dry chemical, it was more effective than sodium bicarbonate-based dry chemicals and was compatible with protein foam.