General type cuprous oxide is an oxide of copper, bright red powder solid, almost insoluble in water, disproportionated into bivalent copper and copper elements in acidic solution, and gradually oxidized into black copper oxide in wet air.

Cuprous oxide is mainly used in the manufacture of ship bottom anti-fouling paint (used to kill low-grade Marine animals), pesticides, and various copper salts, analytical reagents, red glass, but also used in copper plating and copper plating alloy solution preparation.

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