I was at an event with a giant, choreographed firework show. Like they literally brought in Japanese masters of pyrotechnics for it. It was beautiful and all kinds of shapes like flowers and hearts and stuff.
And afaik they do different colours by burning different elements but how do they do specific shapes and like timings? Like one piece of firework having several different layers and colours and stuff. How does it not all explode at the same time in all kinds of directions?
In: 1125
They sort of need to make then propel out a distance, so either layers of smaller fireworks, or they have timed chemical fuses, like coatings on chemically charged for colour(like copper burns green) burn out as a small timing. This way shapes can be made by the level of fuse layer, and timing of that layer exploding. There are different fireworks, and different way fo doing it, the bigger ones can generally do a few layers even 3d shapes.
So the firework propels up, and the core can either strip away, and explode, or blow a few layers at a time, or at once.
The fuses of the charges and layers time the explosions, the shapes come from both the timing of the load, and the fuze coating to make the timing of the burn make a shape.
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