How fireworks maker know what specific kind of design, variety of colors and patterns will come out from a firework when it explode without actually lighting it up?
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The colors are determined by the chemical composition, If you want something to burn red, you add Strontium. As long as you keep your components labeled you can tell them apart. You can also run tests to see the impact of different mixtures on color.
The patterns are decided by how you physically arrange things, you can run tests on how different construction impacts how it looks, then build more in the pattern of the one you liked.
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