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.
Gunpowder Gunpowder was invented around 850 A.D. The Chinese used gunpowder in the early 1230's to launch fireworks and in weapons. Gunpowder was probably used for the first time in Europe during the Battle of Cr cy in 1346.Historians do not know if this invention was carried from China to Europe or in The Europeans invented it independently.n 1456 Gutenberg invented the printing press. This created a widespread of books. Once people owned books reading glasses began to be seen in the hands of the common people. These glasses were made with a variety of materials including wood, lead, copper, bone, leather, and even horn.