Ferrous sulfate heptahydrate, commonly known as copperas, is a green, water soluble, acidic salt, produced during the manufacture of TiO2. Used for agricultural pesticide, fertilizer, feed, pigment , catalyst, decontaminant, antisepticsand magnetic material etc.

In the water treatment industry, ferrous sulfate heptahydrate can be used directly in water treatment plants to improve the coagulation and removal of elements such as phosphorus. In pigment production, copperas is a useful source of iron. Water-soluble and easy to handle, it is commonly used to produce red, yellow and black iron oxide pigments. Cement producers also use ferrous sulfate heptahydrate – harnessing its power to reduce chromium (VI) levels.