Potassium nitrate is probably the most extensively employed oxidizer in pyrotechnics. It is used for a wide variety of applications, the most important of which is in the manufacture of black powder. Potassium nitrate is a white powder or long needle-like crystal. It is great for making black powder, rocket fuel and experiments. Our Potassium nitrate is 99.8 percent pure and ships in a high moisture barrier bag to ensure longevity and freshness.