| 21. | Soldiers needed patches to put between black powder and the lead rifle ball.
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| 22. | Black powder may have been an important invention of Chinese alchemists.
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| 23. | Black powder was used in the pipe bomb at the Olympics.
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| 24. | Nitrocellulose was significantly more powerful than black powder, and was smokeless.
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| 25. | They had not assembled a cache of rifles, black powder and hand grenades.
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| 26. | A powder flask or powder horn could be used to hold black powder.
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| 27. | Potassium nitrate is used to make black powder, explosives, rocket propellants and pyrotechnics.
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| 28. | He is an acknowledged expert jouster, swordsman and black powder shooter.
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| 29. | He placed a layer of black powder on top of an overturned anvil.
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| 30. | The very last inventions of the 15th century were black powder and cannon.
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