What makes a firework?

burning small bits of metal, such as iron or steel filings. The fuse sets off a charge, which ignites the gunpowder.

Explanation:

The source of most fireworks is a small tube called an aerial shell that contains explosive chemicals. All the lights, colors, and sounds of a firework come from these chemicals. An aerial shell is made of gunpowder, which is a well-known explosive, and small globs of explosive materials called stars (Fig.

Explanation:

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