The iron salt used in blue prints is

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(B) The process of making blue prints,known as cyanotype,involves the use of iron salts.Specifically,ferric ammonium oxalate or ferric oxalate,$Fe_2(C

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$Fe_2(C_2O_4)_3$

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(B) The process of making blue prints,known as cyanotype,involves the use of iron salts.Specifically,ferric ammonium oxalate or ferric oxalate,$Fe_2(C_2O_4)_3$,is used as the light-sensitive compound.When exposed to light,the $Fe^{3+}$ ions are reduced to $Fe^{2+}$ ions,which then react with potassium ferricyanide to form a deep blue pigment called Prussian blue $(Fe_4[Fe(CN)_6]_3)$.

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