Ferric Ammonium Oxalate is a derivative of Oxalic Acid. Ferric Ammonium Oxalate is freely soluble in water. Ferric Ammonium Oxalate is a Greenish crystalline powder. It should be stored in tightly closed containers in a Room Temperature. CAUTION THE PRODUCT IS LIGHT SENSITIVE. Ferric Ammonium Oxalate is used in Photography. It is also used to prepare Blue Print Paper. It is used in Aluminium Anodising to impart Golden colour.