... Formula: KNO3,Molecular Weight:101.1, Appearance: white crystal,Assay:99% min, N:13% min, K2O:46% min, Moisture:0.3 ... mostly discontinued due to inconsistent results compared to more modern nitrate and nitrite compounds. Even so, saltpetre is still used in ... the brine used to make corned beef. Sodium nitrate (and nitrite) have mostly supplanted potassium nitrate's culinary usage, as they are more ...