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I would assume your die is steel. It should not be looking like brass. I have never heard of an ultrasonic becoming a plating machine.
What brand of ultrasonic are you using? What cleaning solution are you using? How filthy was your solution? Then the final question is how long did you keep the die in the ultrasonic?
A quality ultrasonic should not require more than ten to fifteen minutes. I use Hornady One Shot on my brass. It states in the directions "Specifically designed to clean brass cases. Do not use on other items."
I have also cleaned nickel plated brass without a problem. I wonder if this could be your problem.
I doubt you have harmed anything. I would think with the appropriate solution in your ultrasonic, your die should return to like factory new.
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