Firecracker

Firecrackers were a type of firework. The Fourth Doctor dropped a firecracker and some blue touch paper down the shaft of the Sacred Flame, which dislodged soot and made the flame burn bright again. (TV: The Brain of Morbius)

Firecrackers were also known as bangers. On the day that Ian Chesterton and Barbara Wright first entered the Doctor's TARDIS, the former confiscated bangers from Tommy Flint. He kept them in his blazer and used them whilst on Destination. (AUDIO: The Destination Wars)