Ammonium nitrate, NHNO, is a colorless crystal ammonium salt that is soluble in water (Photo 7.2). It is a strong oxidizer. It should not be confused with the explosive Ammonium nitrate that is mixed with a hydrocarbon fuel, commercially call ANFO. Specific gravity of ammonium nitrate is 1.72, which is heavier than water. Ammonium nitrate is soluble in water and Ammonium sulfate, (NH)SO, an Ammonium compound, is a brownish-gray to white crystal. Ammonium sulfate is soluble in water and is nonflammable. This compound is an oxidizer with a specific gravity of 1.77, which is heavier than water. The primary uses are in fertilizers, water treatment, fermentation, fireproofing compositions, and as a food additive.