Cuprous oxide (Cu2O) is an oxide of copper also known as Copper(I) oxide. It is insoluble in water and organic solvents. We are manufacturing it by electrolysis method. Cuprous oxide is commonly used as a pigment, a fungicide and an antifouling agent for marine paints. It is used in agricultural fungicide, seed dressing; In Mineral supplements against an insufficiency of copper in the diet of animals, colorant for porcelain, glazes and glass.As an catalyst in various dyes and pharmaceutical industries. Cuprous oxide was the first substance known to behave as a semiconductor. The biological property of copper compounds takes important role in as fungicides in agriculture and biocides in antifouling paints for ships and wood preservations.