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[Cu]2+
Blue.
Cr2O7
Orange.
MnO4
Purple.
CrO4
Yellow.
[Ni]2+
Bright green.
[Cu(NH3)4]2+
Bright blue.
Fe2+
Yellow or green.
Co(H2O)6
Pink.
Fe3+
Red or orange.
CoCl4
Blue.
FeSCN2+
Blood red.