Cupric acetylide, CCu₂

There is some evidence of the direct combination of copper and carbon at high temperatures to form a carbide. The substance is endothermic, and dissociates rapidly in the neighbourhood of 1600° C., but less rapidly at lower temperatures. With ammoniacal solutions of cupric salts acetylene yields a flocculent, black precipitate of varying composition, but approximating to the formula CCu₂. It explodes at 70° to 80° C.