vesicles
Colonel
OT
I doubt there is a report on the discovery or invention of gunpowder. But we cannot doubt that some Chinese invented the gun. The oldest European picture of a gun is from 1325 while I once saw a photo in the magazine Technology and Culture of a very similar gun depicted in a temple built in 1198. And you don't find a gun lying about before someone invented it.
The Chinese invented hand-held cannons using bamboo to shoot projectiles out. The European invented the modern firearm using the trigger mechanism found on crossbows, which were invented by the Chinese.