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Acid, Phosphotungstic

Tungsten hydroxide oxide phosphate. A White or slightly yellowish-green, slightly efflorescent crystal or crystalline powder. It is used as a reagent for Alkaloids and many other Nitrogen bases, for Phenols, albumin, Peptone, Amino Acids, Uric Acid, Urea, Blood, and Carbohydrates. (From Merck Index, 11th ed)