In Journal of Analytical Toxicology, Volume 27, Number 7, October 2003 , pp. 485-492(8). The time to reach 500ng/ml (the point when they can't tell if their testing equipment is giving type I/II errors, as best I understand) is ~47h:30m.
The Chinese finally realized that if you explode gunpowder near people they might die so they started using it in war as a kind of explosive. When Chinese alchemists invented gunpowder it was a mistake. The alchemists were trying to find a potion for immortality and instead they wound up making an explosion.So the opposite effect came out of the original Idea.ne big use that gunpowder evolved into that did not really relate to war was mining. You could mine a whole lot faster by blowing holes in the rock than chipping it with an ax. The invention of gunpowder, and the weapons it is used in, forced war to be in different locations.
700 AD Chinese Invent Gunpowder-The Chinese combined saltpeter, sulpher, and carbon to create gun powder. The Chinese used gun powder primarily for fireworks.700 AD Srivijaya Empire (Indonesia) -The Srivijaya Empire becomes the leading power in Indonesia.The Srivijayas originated in southern Sumatra.05 AD Wu Hou Empress Of China-Wu Hou became Empress of China in 705. She was the first woman to rule China and during her reign strengthened the T'ang Dynasty. 707 AD Muslim Army Conquers Tangiers-Tangiers was captured by Muslim armies under the command of Musa ibn-Nusayr in 707.