Ammonium Molybdate is an odourless crystalline compound ranging in colour from white to yellow-green. It is also called molybdic acid hexammonium salt tetrahydrate, ammonium molybdate tetrahydrate, and ammonium heptamolybdate tetrahydrate. as an analytical reagent to find the presence of phosphates, silicates, arsenates and lead in pigments. In the production of molybdenum metal and ceramics. In the preparation of dehydrogenation and desulphurisation catalysts. In the fixing of metals and in electroplating. In fertilizers for crops and as a negative stain in biological electron microscopy.