Characters: red-brown powder

Relative density (water = 1): 5.24

Melting point: 1565 ℃

Stability: stable, soluble in hydrochloric acid, sulfuric acid is generated +3 price of iron salt.

Solubility: insoluble in water, not reacting with water.

Oxidizing: (high temperature) are CO, H2, Al, C, Si, etc. restoration.

Used in paint, printing ink, rubber and so on.