Lots of Americans will celebrate the Fourth of July by illuminating the night sky with sparklers, smoke bombs, roman candles, ground spinners, and many other types of firecrackers. Fireworks get their splendor from a variety of chemicals, such as potassium chlorate, potassium perchlorate, potassium nitrate, sodium benzoate, sodium oxalate, ammonium perchlorate, strontium nitrate, strontium carbonate,