| M Formula: | Di2O3 |
| Properties: | |
| Brown powder. Insoluble in water; soluble in acids. | |
| Use: | |
| (As salts) Coloring and decolorizing glass, in temperature-compensating capacitors for radio, television, and radar. In carbon-arc cores (fluoride), in stainless steel (oxide), metallurgical research, textile treatment. | |