Answer to Question #29801 in Organic Chemistry for alina
FeO + 2H+ = Fe2+ + H2O
Fe2O3 + 6H+ = 2Fe3+ + 3H2O
Fe3O4 + 8H+ = 2Fe3+ + Fe2+ + 4H2O
so you need to add some amount of zinc
Zn + 2Fe3+ ---> Zn2+ + 2Fe2+
but Fe2+ is rapidly oxidized on air to Fe3+
Thus, to discolor limestone at home is almost impossible.
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