Smoke bomb
Smoke bombs are a firework designed to produce colored smoke upon ignition. While there are smoke generating devices that are dropped from airplanes, the term "smoke bomb" is typically used to describe the three varieties of smoke devices:
1) Smoke Balls - hollow, cherry-sized spheres of brightly-colored clay filled with a smoke composition. They produce a forceful jet of colored smoke for 10-15 seconds
2) Smoke Candles - (also called a smoke generator or smoke canister) cylindrical cardboard tubes with a fuse, usually an 1 1/2 in diameter and several inches long and look like a giant firecracker. Such devices create a thick cloud of smoke for up to several minutes. Uses include providing smoke for smoke testing and creating a smoke screen for paintball games.
3) Smoke Canister - A metal can that releases smoke when a pin is pulled. Used for signalling by military personel.
Colored smoke devices use a formula that consists of an oxidizer, typically potassium chlorate (KClO3) and a powdered organic dye. The burning of mixture evaporates the dye and forces it out of the device, where it condenses in the atmosphere to form a "smoke" of finely-dispersed particles.
Devices or cartridges containing only the dye are used with an external heat source in a smoke machine.
