Copper(II) sulfate, with the chemical formula CuSO4, is a blue crystalline compound that is soluble in water. It is commonly used in agriculture as a fungicide and in the textile industry as a dye fixative. Copper(II) sulfate is also utilized in the manufacture of pigments, batteries, and as an algaecide in water treatment. Its distinctive blue color and reactivity make it a versatile chemical in various industrial applications, including chemical analysis and electroplating.