Phosphomolybdium Tungstic Acid (PMTA) also has titles such as tungstomolybdophosphoric acid, tungstophosphomolybdic acid, molybdenumphosphotungstic acid, and phosphomolybdotungstic acid. Common as a goose yellow or yellow aqueous solution. It can be used as a coloring agent for spectrophotometric detection of tannins; it can also be used as an indicator; it can be used in the experiment of determining the total content of tannins by the phosphomolybdotungstic acid-casein method.
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