pink
all cobalt (+ 2) salts are red but with sulphate cobalt shows pinkish red colour.....
aluminum sulphate is colourless
cobalt sulphate hepta hydrate
No colour
Cobalt (II) chloride dihydrated (purple colour) and with more water Cobalt (II) chloride hexahydrated (pink colour) .
Copper sulphate's colour is blue.
Blue
If this is what u asked then the answer is: Fe=Iron Co=Cobalt "SO4"=Sulphate "FeSO4"=Iron Sulphate
Radioactive or not, pure cobalt is a gray metal.
Red cobalt
The colour of Copper sulphate is blue because Copper ions absorb light in all frequencies except blue which is reflected instead.
The aqueous solution of ferrous sulphate is typically pale green in color.