Structure of Spring Festival cannon

The outermost layer is paper, which is tightly wrapped.

The innermost part is gunpowder,

Mud at two ends and fuse at one end. This is the simplest gun.

There are other reasons, but the gunpowder is different;

Fireworks are looser than guns, and one end is not blocked to prevent explosion.

And let it spray, as for what color fireworks use what powder, it belongs to chemistry.