Iron in Ancient India c7.s5.t1.31

c7.s5.t1.31

¹ Of Roscoe and Schorlemmer's " Treatise on Chemistry," Vol. II, Part 2, " Magnetic oxide of iron ";—" when iron is heated to redness in the air, it becomes coated with iron scale. This is a mixture or a compound of the monoxide and sesquioxide in varying proportions. The inner layer which is blackish grey, porous, brittle, and attracted by the magnet, has the composition 6 Feo Fe₂O₃ and is not magnetic. The outer layer contains a larger quantity of ferric oxide, is of a reddish colour and is more strongly attracted by the magnet than the inner portion."