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A simple model demonstrating the process of manufacture in case of ball milling  Black powder is a chemical mixture invented in the 9th century and was practically the only known propellant and explosive until the middle of the 19th century. As such it has been superseded by more efficient explosives such as smokeless powders and TNT. It is still manufactured today although primarly used in fireworks, model rocket engines, and in reproductions of muzzleloading weapons. Black powder is commonly r

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