16 February 2012, 06:24
Mike Bratcher, The best place to gather urine is in a Farmyard. Animals are a good source for a large volume of urine. Boil it down, you will need gallons of it if you need a great amount of saltpetre. Do not boil it dry. When you have a half inch of sludge left let the rest of the urine evaporate. If boiled dry it will burn up with a huge flame. You must be careful how you treat such things. When you reach the sludge state you can use it to manufacture fuse. Reply here, as I cannot find where you asked your question. Kenneth Eames.