What color is coper oxide? Chemistry Matter Compounds 1 Answer Nathan L. May 22, 2017 #Cu_2O#: reddish-brown #CuO#: black-dark gray Explanation: It depends on which oxide of copper is in question, #Cu_2O# or #CuO#. #Cu_2O# is a reddish-brown color, and #CuO# is solid black to dark gray. Answer link Related questions Why compounds of transition metals are coloured? What compounds conduct electricity? Are compounds considered pure substances? What compounds are insoluble in water? What compounds are electrolytes? What compounds are hydrophobic? How can I calculate the molar mass of a compound? How can compounds be broken down? Can compounds be both ionic and covalent? How are molecular compounds named? See all questions in Compounds Impact of this question 1983 views around the world You can reuse this answer Creative Commons License