Gun powder was invented during he Sui and Tang dynasties (AD 581 - 907). It was started off during the alchemy of immortality medicine process. So gun powder was invented unintentionally.
Surly the creation of immortality medicine failed. However gun powder was used as medicine. As Běn cǎo gāng mù ( the bible of Chinese medicine) stated, it can heal skin ulcers, cue plaque, use as insecticide.
Later on the gun powder techniques transferred to the military development, and hence became one of the four greatest invention in China.
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