That rotor Gerry is painted black for shipping and sale display purposes......the first time you hit the brakes, the black will go away from the swept surface but the hat will stay black.
Snake, you can also use a stainless steel washer for the rotor: Spin it on a drill and use an old flatblade screwdriver against the spinning washer to create the rotor machined look, then attach the caliper from the assembly above to it.
Looks like this when done \/