synonums: Iron(III) chloride hexahydrate .................Ferric chloride hexahydrate, with the formula FeCl3·6H2O, is a crystalline compound containing iron, chlorine, and water. It is commonly used in water treatment as a coagulant to remove impurities and in the production of pigments and dyes. This compound is also utilized in the etching of metals and in the synthesis of other chemicals. In its hexahydrate form, ferric chloride appears as yellow-brown crystals that are soluble in water, forming a yellow solution. It plays a role in various industrial processes due to its strong oxidative properties and ability to react with other substances.