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1.https://www.wildernessarena.com/supplies/weapons/how-to-make-gunpowder-charcoal-sulfur-potassium-nitrate
2.http://www.silk-road.com/artl/gun.shtml
3.

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Black powder is used as a propellant for bullets, as well as for fireworks and rocketry. Learn how gunpowder works and a bit about its history.

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China

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The raw materials are Charcoal, sulfur, and potassium nitrate.

Charcoal and sulfur act like the fuel for the gunpowder and the potassium act like the oxidizer.

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Gun Powder was made by mixing sulfur, charcoal, and potassium nitrate.

The charcoal traditionally came from the willow tree but they used other trees.

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China had a surplus of Gunpowder because they were the on who invented it.

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Where was this good valued during Silk Road times? (Where was it scarce?)

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Where was this good valued during Silk Road times? (Where was it scarce?)

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This good was very scared in the west

( Europe and etc). So they would often trade with China.