A mainstay of a certain national holiday, fireworks are relatively low-yield explosives designed mainly to provide impressive pyrotechnic displays. They are commonly filled with gunpowder to give thrust and to cause the initial explosion, and varying chemicals and compounds to give the colors and patterns of the explosions. Different ingredients give different explosions in different colors, patterns, and configurations, to the point where you can deliberately make intricate shapes from the blasts.
Examples of materials used in fireworks can range from barium, which in most forms gives green colors, to calcium which provides red colorations, as well as copper, which gives the display blue colors. These are merely some of the chemical groups which can have effects on the blasts, and not all chemicals are used for coloration. Some can control when the explosion happens, some can control how large or small the blast is, some are even used merely to help keep a firework together.
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