Magnesium emits ultraviolet light when burning, so one must not look directly at the flame. Magnesium is used in flares and tracer ammunition.
Fighting a magnesium fire is quite unusual. It actually burns better in carbon dioxide, so fire extinguishers can accelerate the fire, instead of extinguishing it. Adding water occasionally causes a steam explosion, which spreads the fire. Water can even split into hydrogen and oxygen in a magnesium fire, resulting in a hydrogen explosion.Learn more about Chemistry