Copper sulfate is a chemical compound which is produced commercially by reacting various copper(II) compounds with sulfuric acid. This compound is used in a wide range of industries, from pyrotechnics to viticulture. It is also known as bluestone or blue vitriol, although these terms are not as widely used as they once were. Some caution is required in handling copper sulfate, as it is toxic and acidic, and it can pose health risks to living organisms.