Nickel sulfate is a chemical compound with the formula NiSO4. It appears as a greenish crystalline solid and is commonly used in various industrial applications, including electroplating and the production of nickel-based batteries. Nickel sulfate is soluble in water, making it useful in processes that require a liquid form of nickel. In addition to its industrial uses, nickel sulfate is also important in the production of catalysts and in the manufacturing of certain types of glass. However, it is essential to handle this compound with care, as it can be toxic and may cause skin irritation upon contact.