at, Li Chen bowed to Zhao Qinglan and said: "Your Majesty, everything I have done was out of necessity. It was all for the Ninth Prince to become a capable person as soon as possible, to share the wor... now. From large red-clad cannons to small fireworks for the common folk, it's no longer anything new.But all of these gunpowder, without exception, are the least efficient black powder.Poor stability...