Blue vitriol, also known as copper(II) sulfate, is a blue crystalline solid commonly used in various applications. It is often found in agriculture as a fungicide and herbicide, helping to protect crops from diseases. Additionally, it is used in laboratories for chemical experiments and in the production of other copper compounds. This compound is soluble in water, forming a blue solution that can be used in electroplating and as a dye. When heated, blue vitriol loses water and turns into a white powder called copper(II) sulfate pentahydrate. Safety precautions are necessary when handling it, as it can be harmful if ingested or inhaled.