Phosphomolybdic acid is mainly used as an oxidation-reduction catalyst, such as direct oxidation of methane to formaldehyde, propylene oxidation to acrolein acetone, propylene ammoxidation to prepare acrylonitrile, etc. It is also used as a weighting agent for silk and leather. The raw materials and analytical reagents for the preparation of organic pigments are used for the detection of alkaloids, urea, xanthine, creatinine, ammonium, amines, and certain metals, and are used for microanalysis to determine antimony, cerium, copper, thallium and vanadium. It is used in nerve staining with hematoxylin, and is also used in corrosion inhibitors, pigments for highway road signs.…