A sparkler is a type of hand-held firework that burns slowly while emitting bright, colored sparks.
A sparkler on a Christmas tree
A "Morning Glory" type sparkler, emitting small pyrotechnic stars during this phase of the burn
Sparklers are popular fireworks for children
Moving sparklers quickly can create attractive patterns
Potassium perchlorate is the inorganic salt with the chemical formula KClO4. Like other perchlorates, this salt is a strong oxidizer although it usually reacts very slowly with organic substances. This, usually obtained as a colorless, crystalline solid, is a common oxidizer used in fireworks, ammunition percussion caps, explosive primers, and is used variously in propellants, flash compositions, stars, and sparklers. It has been used as a solid rocket propellant, although in that application it has mostly been replaced by the higher performance ammonium perchlorate.
Potassium perchlorate
Potassium perchlorate in crystal form