or you could google "dark metallic green spray paint".......
but on a technical side of it...lets say your paint isnt dark enough..... get two tips off of a wd-40 can, but first spray a little out of the metallic can so it loses presure and has room inside. then put the red wd-40 straw in the middle of the tips, make sure theyre connected all the way.
press gently on the black can, not all the way down at first....and spray black into the metallic can
make sure you shake up the can before using it
similarly, white will lighten it.
i really doubt youll go that far, but thats a old graf writer trick