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Fe(OH)3
red
Fe(OH)2
green
Al(OH)3
white
Cr(OH)3
green
Co(NH3)63+
amber
Ni(NH3)62+
blue
Zn(NH3)42+
colorless
FeS
black
CoS
black
NiS
Black
MnS
Peach
ZnS
White
Fe3+
yellow
Al3+
colorless
Cr3+
green
Co2+
pink to wine red to blue (pink to blue)
Ni2+
green
Mn2+
faint pink
Zn2+
colorless
Co(OH)2
blue-pink
Ni(OH)2
green
Mn(OH)2
tan
Al(OH)4-
colorless
Cr(OH)4-
green
Zn(OH)42-
colorless
Co(OH)3
Black
MnO2
black
CrO42-
yellow
Cr2O72-
orange
Fe(SCN)63-
blood red
Co(SCN)42-
blue
NiC8H14N4O4
strawberry red
MnO4-
purple-pink
Al(OH)3 + aluminon
Red
BaCrO4
yellow
CrO5
blue
Zn(NH3)42+ on Diphenylthiocarbazone
purplish-red