Copper(I) sulfate, also known as cuprous sulfate, is a chemical compound with the formula Cu2SO4. It consists of copper in the +1 oxidation state and a sulfate ion. This compound is typically found as a white or light blue solid and is less common than its more stable counterpart, Copper(II) sulfate. Copper(I) sulfate is used in various applications, including agriculture as a fungicide and in chemical synthesis. It can also serve as a precursor for other copper compounds. However, it is important to handle it with care, as it can be toxic in certain concentrations.