Painted Front Bumper Assistance

Is there a way to tell if the bumper underneath is chrome already? I knocked on it and it sounds like steel, but I don't know enough about chrome to really tell, some of the marks where the paint is gone are shiny, but could just be bare metal. What are the chances they just painted over chrome? Can you even do that?
Painting over chrome is a crap shoot.....usually crap. lol Because in order to do it right, the chrome has to be chemically stripped. First, that's expensive. People will tell you that you can blast chrome and give it "tooth" so you can paint it. But the chrome is still there and you always have a chance of it blistering up later.......and it will because it already has in places.