Iron(II) chloride is a white or pale green crystalline solid that is soluble in water. It is a reducing agent and is used in the production of other iron compounds, as a mordant in dyeing, and as a flux in soldering.
Iron(III) chloride is a dark brown or black crystalline solid that is soluble in water. It is an oxidizing agent and is used as an etchant in the production of printed circuit boards, as a coagulant in water treatment, and as a catalyst in various chemical reactions.
