How to Use "saltpeter" with Example Sentences

1. Taught us to mix sulphur and saltpeter .
2. Where did you get the saltpeter ?
3. Back then , potash was derived from the ashes of hardwood trees and other plants , and mainly used to make soap , glass and saltpeter for gunpowder .
4. Humberstone processed the largest deposit of saltpeter ( nitrate 's nickname ) in the world and provided the valuable mineral to countries in north america and europe for fertilizers , food preservatives and explosives .