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Blue Tungsten Trioxide are Blue Finely divided Solid Crystals, Highly Thermally Stable and Water Insoluble Compound of Tungsten. Blue Tungsten Oxide is used in a Production of Tungsten Metal Powder by Reducing Techniques of Powder Metallurgy. Blue Tungsten Trioxide is Produced from Ammonium Paratungstate in a closely Controlled Temperatures in a Reducing Atmosphere.