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[Cr(H2O)6]3+
green/purple
Cr(OH)3(H2O)3
green
[Cr(NH3)6]3+
purple
[Cr(OH)6]3-
green
[CrO4]2-
yellow
[CrO7]2-
orange
[Mn(H2O)6]2+
very pale pink
Mn(OH)2(H2O)4
beige
[MnO4]-
purple
[Fe(H2O)6]2+
green
Fe(OH)2(H2O)4
green
[Fe(H2O)6]3+
yellow
Fe(OH)3(H2O)3
orange/brown
[Cu(H2O)6]2+
blue
Cu(OH)2(H2O)4
blue
[Cu(NH3)4(H2O)2]2+
deep blue
[CuCl4]2-
yellow