For this estimation, solutions of the chloride as well as those of the
sulphate (ammonium, iron, alum) may be used in the manner previously
described. The electrolysis is best effected in the presence of a
sufficient quantity of ammonium oxalate; no separation of any iron
compound takes place. The iron is deposited in the form of a bright,
steel gray, firmly-adhering mass on the platinum dish. The iron may be
exposed to the air for several days without any noticeable oxidation
taking place.