what is in urine for gun powder?
 Gunpowder is comprised of 75% potassium nitrate, 15% charcoal and 10% sulfur. While charcoal (historically made with wood) and sulfur (historically dug from the ground around volcanoes) have been relatively easy to obtain, potassium nitrate is not commonly found in nature.The rest is secreted out of the body in the form of urine; this pee, however, still contains some handy chemical elements like potassium and magnesium, as well as urea and nitrogen. 