Fire Crew on hand line. Thomas Fire, Alpine Ranger District, Apache-Sitgreaves National Forest, Arizona, June 2003.
Burn out using a Ping Pong ball machine. Ping pong ball size spheres filled with potassium permanganate are injected with glycol (antifreeze) and dropped by a machine mounted in a helicopter. 45 seconds later an exothermic reaction causes them to burst into flame. Now days they uses drones dropping "Dragon Eggs", much safer.