Colours

Solution of Fe²⁺

pale green

Fe(OH)₂ precipitate

pale green

Solution of Fe³⁺

yellow

Fe(OH)₃ precipitate

orange-brown

Cu solid

Brown

Solution of Cu²⁺

pale blue

Cu(OH)₂ precipitate

pale blue

Solution of [Cu(NH₃)₄(H₂O)₂]²⁺ ions

dark blue

Solution of [CuCl₄]²⁻ ions

yellow

Solution of Cr³⁺

violet

Cr(OH)₃ precipitate

grey-green

Solution of [Cr(OH)₆]³⁻

dark green

Solution of [Cr(NH₃)₆]³⁺

purple

Solution of [Cr(H₂O)₅SO₄]⁺

(when H₂SO₄ is present)

green

Solution of Cr₂O₇²⁻

orange

Solution of Mn²⁺

pale pink

Mn(OH)₂ precipitate

light brown

Solution of MnO₄²⁻

purple