1. High-temperature superconductors, made of copper oxides , tend to be brittle, however. 2. Copper thermite, using copper oxide , is used for creating electric joints: 3. In 1885 he started the Imperial Oil Company in copper oxides . 4. Solid-state technology was in its infancy, represented by copper oxide and selenium rectifiers. 5. Ultramarine withstands heat, but azurite turns to black copper oxide . 6. Copper oxide from copper pipes may cause calthemites to be coloured green or blue.7. The thin copper oxide is a solid and essentially protects the unoxidized copper underneath. 8. The bulk of the copper oxide is turned back into the form of sulfide. 9. For instance, a copper oxide coating on the keys would suggest the presence of copper. 10. YBCO tape is often referred to as rare-earth barium copper oxide ( REBCO ) tape.
