| Red-brownish tint appears because of the formation of protoxide and oxide of copper. |
| What is the difference between peroxide and protoxide of iron? |
| They are variable mixtures of the metamorphous carbonates of protoxide of iron and lime. |
| The chief oxides of uranium are the protoxide and the sesquioxide, or uranic oxide. |
| The sedative effect of the nitrogen protoxide can be also useful for elderly subjects presenting cognitive disturbances. |
| The manufacture of adipic acid, of which Rhodia is the world's second largest producer, and its use as a raw material for Polyamide 6.6, generates nitrogen protoxide. |
