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Cr³⁺(aq)
green
Cr(OH)₃(s)
grey-green
[Cr(OH)₆]³⁻(aq)
dark green
CrO₄²⁻(aq)
yellow
Cr₂O₇²⁻(aq)
orange
Mn²⁺(aq)
pale pink
MnO₂(s)
black/brown
MnO₄²⁻(aq)
green
MnO₄⁻(aq)
purple
Fe²⁺(aq)
green
Fe³⁺(aq)
yellow
Fe(OH)₂(s)
dirty-green
Fe(OH)₃(s)
red-brown
[Fe(SCN)(H₂O)₅]²⁺(aq)
blood-red
Cu₂O(s)
red-brown
CuI(s), CuCl(s)
white
Cu²⁺(aq)
blue
Cu(OH)₂(s)
pale blue
[CuCl₄]²⁻(aq)
yellow
[Cu(NH₃)₄(H₂O)₂]²⁺(aq)
dark blue
Cu(edta)²⁻(aq)
pale blue
CuCO₃(s)
blue-green