| http://www.w3.org/ns/prov#value | - The metal surface also can include metal oxides, such as copper oxides such as cuprous oxide (Cu2O) or cupric oxide (CuO), as well as copper hydroxide (CuOH2), and metal ions, such as cuprous (Cu+) and cupric (Cu2+) cations. [0021] The slurry of the present invention reduces the hardness of the metal surface as compared to a hardness of the metal surface in a presence of a conventional non-acidic
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