Which of the following statement is incorrect about the making of blue Prints?
(a) Ferric oxalate or citrate are reduced to ferrous salt on being exposed to light
(b) Ferrous salt gives blue colour with
K3[Fe(CN)6]
(c) Ferric salt gives blue colour with K3[Fe(CN)6]
(d) White lines are obtained in place of the ink drawing on a deep blue ground
