I have a black car which has a few scratches. When looking at them I see white. I'm not sure what the white is. Is it the primer? Clearcoat? Some of them I can feel with my fingernail and others I can't feel at all. Is there a way to remove these? I assume the deeper ones would need to be repainted, but what about the other ones? I've never really understood what I was looking at when viewing scratches on cars.