Transition metal salts. Transition metal salts are often colored. Photographed here, left to right, front row: cobalt(II) chloride hexahydrate (CoCl2 6H2O, purple, in a vial), copper(II) carbonate (CuCO3, blue-green, in an evaporation dish), iron(II) sulfate heptahydrate (FeSO4 7H2O, pale green, in a Petri dish), copper(II) sulfate pentahydrate (CuSO4 5H2O, blue, in a beaker); back row: manganese(II) carbonate (MnCO3, pale pink, in a beaker), nickel(II) sulfate hexahydrate (NiSO4 6H2O, green-blue, in a beaker), potassium chromate(VI) (K2CrO4, yellow, in a vial), chromium(III) potassium sulfate dodecahydrate (KCr(SO4)2 12H2O, dark red, in a beaker).
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