Copper sulfate is an inorganic copper salt used in water treatment and agriculture. It serves as an algaecide and fungicide. Other applications include feed additives, pigment and catalyst intermediates, and use as a mordant in textile dyeing. The material is described as blue crystals or crystalline powder. Recorded grades are technical, food, feed and high-purity. Packaging formats include 25 kg bags, 1000 kg big bags and bulk. Food use is subject to the applicable food-additive specification and permitted-use conditions.