Colors of ions

Co^2+
Dark pink
Cu^2+
Blue or Blue-green
Fe^2+
light blue green
Fe^3+
Yellow-gold
Ni^2+
Light green
Cr^3+
forest green
CrO4^2-
yellow
Cr2O7^2-
orange
MnO4^-
purple
F2
Yellow
Cl2
Green
NO2
Red-brown
Ba^2+
Yellow-green
Ca^2+
orange
Na^+
orange
Cu^2+
Emerald
K+
Lavender
Li+
Scarlet
Sr^2+
Red-orange
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