... 2190, UN NO.1486,CLASS 5.1 Potassium nitrate colorless crystal powder, Relative density2.1109, Melting ... , fuse , firecrackers and other raw materials. pharmaceutical industry for the production of potassium penicillin, rifampin drugs. ... nitrate in food consumption industry as a hair color agent; preservatives, such as for bacon, luncheon meat played a preservative.. Potassium Nitrate industrial grade ...