If you want beautiful fireworks bursting in the sky, you're going to need to mine the Earth first. Fireworks get their colour from metal salts. A salt is a chemical compound formed when an acid and base neutralize each other.
Many of the salts include an oxidizer like nitrates, chlorates, or perchlorates. Along with imparting colour, these oxidizers provide oxygen, allowing the fireworks to burn. The metals or salts can also be stabilizers, keeping the colour-imparting elements stable until showtime.
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