Iron oxide, also known as ferric oxide, burnt limonite, burnt ochre, iron red, iron red, red powder, Venetian red (the main component is iron oxide), etc. The chemical formula Fe2O3, soluble in hydrochloric acid, is a reddish-brown powder. Its reddish-brown powder is a low-grade pigment, which is called iron oxide red in industry. It is used in paint, ink, rubber and other industries as catalyst, polishing agent for glass, gemstone and metal, and can be used as raw material for iron making.