Some recommend using empty (unused) paint cans to store black powder.You can buy powder containers at hardware stores or online.In any case, store the black powder in a stable area where it will not come into contact with a flame or be exposed to high temperatures. Consider storing it in a fireproof box in a shed or another area outside your home.

government agency responsible for promoting safe environmental practices Go to source Place the black powder in a special container designed for gunpowder. X Trustworthy Source United States Environmental Protection Agency Independent U.S. After about 10 months, dry it out on trays. Urinate into it, then top it off with water. To do so, one process is to fill a drum with manure affixed with a drain, valve, and filter at the bottom. This is definitely the most difficult way to source saltpeter, but some black powder enthusiasts prefer to make their powder entirely from scratch. Cold packs which can be bought for a few dollars to help with sore muscles contain sodium nitrate and water and can be used to make saltpeter. If you do a search for saltpeter, you'll get plenty of results, and you can easily have a bottle delivered to you. You may also find it labeled as saltpeter, niter, or potassium nitrate. Look for 'stump remover' in garden stores.You have several options for sourcing saltpeter: In the days when black powder was widely used, saltpeter was manufactured from bat guano or made from horse urine and other 'manure soils.' X Research source It's used in many fertilizers, as part of science projects, and in certain recipes.

Saltpeter is the common name for potassium nitrate.

Making saltpeter from chicken manure