Potassium thiocyanate added to a solution of Fe^3+ gives

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Potassium thiocyanate added to a solution of $Fe X^{3 +}$ gives

Fe X^{3 +}

forms the blood-red thiocyanato complex, written

[Fe (SCN) (H X_{2} O) X_{5}] X^{2 +}

. The blue precipitate is the Prussian blue test with hexacyanoferrate(II).