compounds that are blue, other than CuSO4?

Question

and compounds that are green.

one more question,
cobalt (in a free element) is it blue or metalic colour?
I have seen a metalic grey cobalt, but some books mention that cobalt is blue.

Answer 1

Some blues:
Nickle Sulfate NiSO4.7H2O
Barium sulfate-permanganate (Manganese Blue)
Indigo C16H10N2O2
Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Lapis lazuli)
Prussian blue Fe7(CN)18

Answer 2

Try some of the peroxide compounds.

There's a stain used in micro-biology for staining the micro-bacteria, I think it's an iodine base solution.

Also consider compounds that burn a blue flame.

Answer 3

I like Molybdinum compounds as blue

green copper chloride

Answer 4

Actually, the compound CuSO4 or cupric sulfate is not really blue... that blue substance is actually Cupric sulfate pentahydrate or CuSO4*5H2O

Answer 5

Here's a really blue compound: FD&C Blue #1, (blue food coloring)

Chemical Name: FD&C Blue #1
CAS Registry Number: 003844-45-9
Synonyms: FD&C Blue #1; CI Acid Blue 9, disodium salt; Brilliant Blue FCF, disodium salt; Ammonium, ethyl(4-(p-(ethyl(m-sufobenzyl)amino)-alpha-(o-sulfopbenzylidene)-2,5-cyclohexadien-1-ylidine)(m-sulfobenzyl)-, hydroxide, inner salt, disodium (o-sulfophenyl)benzylidene)-2,5-cyclohexadien-1-ylidene) (m-sulfobenzyl)-, hydroxide, disodium; Benzenemethamaminium, N-ethyl-N-(4-((4-(ethyl(3-sulfophenyl)methyl)amine)phenyl)(2-sulfophenyl)-2,5-cyclohexadien-1-ylidine)-3-sulfo, hydroxide, inner salt, disodium salt; D&C Blue #4

And for green: FD&C Green #3:

Chemical Name: FD&C Green #3
CAS Registry Number: 002353-45-9
Synonyms: Benzenemethanaminium, N-ethyl-N-(4-((4-(ethyl((3-sulfophenyl)methyl)amino)phenyl)(4-hyd- roxy-2-sulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-3-sulf- o-, hydroxide, inner salt, disodium salt; CI 42053; FD & C Green no. 3; Fast Green FCF; Food green 3; Ammonium, ethyl(4-(alpha-(p-(ethyl(m-sulfobenzyl)amino)phenyl)-4-hydroxy-3-sulfobenzylidene)-2,5-cyclohexadien-1-ylidene)(m-sulfobenzyl)-, hydroxide, inner salt, disodium salt; Benzenemethanaminium, N-ethyl-N-(4-((4-(ethyl((3-sulfophenyl)methyl)amino)phenyl)(4-hydroxy-2-sulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-3-sulfo-, hydroxide, inner salt, disodium salt

Elemental cobalt is "a brittle, hard metal, closely resembling iron and nickel in appearance" according to my 66th edition of the CRC Handbook of Chemistry and Physics.

Answer 6

maganese though I don't specifically which compound, that will be blue.

copper burns green