Cu- CuO - Cute(OH) 2 - CoSO4 - CuCl2

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Copper oxide (CuO), also known as cupric oxide, is a black solid compound that is commonly used as a pigment in ceramics and in the production of batteries. When mixed with water, it can form copper hydroxide (Cu(OH)2), a blue solid also known as cupric hydroxide.

Copper sulfate (CoSO4) is a blue crystalline compound used as a fungicide, herbicide, and pesticide. It is also used in electroplating and as a coloring agent in fireworks.

Copper chloride (CuCl2) is a greenish-blue solid compound used in the production of pigments, as a catalyst in chemical reactions, and as a mordant in dyeing and printing textiles.