Tungsten trioxide (chemical formula: WO3) is an important inorganic compound with the following characteristics:

I. Physical Properties

Appearance and Color: It is usually yellow in powder form, and its color may change from light to dark when heated.

As a special form of tungsten oxide, orange tungsten oxide possesses a series of unique characteristics:

I. Color: The most prominent characteristic of orange tungsten oxide is its bright orange color. This color arises from defects, impurities, or the presence of low-valent tungsten ions in the crystal structure of tungsten oxide, giving it a highly recognizable appearance.

Tungsten dioxide (WO₂), also known as brown tungsten oxide, is an inorganic compound composed of tungsten and oxygen. It mainly has the following characteristics:

Violet Tungsten Oxide (VTO) is a unique tungsten oxide with the chemical formula W18O49 or WO2.72. The characteristics of Violet Tungsten Oxide are briefly described below: