I stripped an either chrome or nickle plated Kragone time. When the exterior came off it was copper washed underneath.
I glass beaded the copper wash and then phosphor blackened the metal no problem.
If I would have taken the time to completely hand polish the reciever like one would have normally done it would have come out exceptionally well.
Because of all the different acid striking and pickling done to either chrome or nickle before plating actually occurs I'm hesitant to say what type of finish either or is.
This example, I suspected nickle for how easily it stripped off to the copper underneath even though it was somewhat mirror finish before I started into it.
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