Fe^2O^3

Fe^2O^3 is the chemical formula for iron(III) oxide, which is commonly known as rust. It is a reddish-brown compound that forms on the surface of iron or iron-containing materials when they are exposed to oxygen and moisture. Iron(III) oxide is commonly used as a pigment in paints, ceramics, and pigmented concrete. It is also used in the production of steel and as a catalyst in chemical reactions.