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三氧化钨是钨的氧化物，是从钨矿制取单质钨工业的重要中间体。

Blue tungsten oxide, short for BTO, is a kind of tungsten oxide, the appearance is dark blue in powder form.

Yellow tungsten oxide is a finely divided, yellow crystalline powder, it is produced by roasting ammonium paratungstate at closely controlled temperatures to drive off combined water or water and ammonia.

Violet tungsten oxide is a purple or blue-violet crushed crystal powder, shorted for VTO, formula of WO2.72 or W18O49, prepared by APT wet hydrogen direct reduction, tungstic acid hydrogen reduction and APT mild reduction method, mainly used for manufacturing tungsten powder and tungsten carbide powder.

钨酸是无色结晶或白色结晶性粉末，溶于水，不溶于乙醇，微溶于氨。