... 2190, UN NO.1486,CLASS 5.1Potassium nitrate colorless crystal powder, Relative density2.1109, Melting Point 333°C. Use: ... produce black powder, such as mining gunpowder, fuse , firecrackers and other raw materials. pharmaceutical industry for the production of potassium penicillin, ... used in the manufacture of ceramic glazes. heat bath. Potassium nitrate in food consumption industry as a hair color ...