The iron salt used in blue prints is :

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Problem

The iron salt used in blue prints is : (1) FeC2O4\text{FeC}_2\text{O}_4 (2) Fe2(C2O4)3\text{Fe}_2(\text{C}_2\text{O}_4)_3 (3) K4Fe(CN)6\text{K}_4\text{Fe}(\text{CN})_6 (4) FeSO4\text{FeSO}_4

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