There may be others who know more about this than I do, but I *think* the way this works is essentially the opposite of how a plate is chromed in the first place. The Q-tip is soaked in acid, and connected to the + terminal. Effectively this sucks the chrome off of the plate.
My understanding is that when the plate was chromed in the first place it was placed in some sort of chrome acid bath with the charges reversed so that the chrome would stick to the plate.
So, the form of etching I did should only work with something that has been chromed or anodized. If the black on your neck plate is paint, I don't think this will work. If the black was a form of anodizing, it might work...but I am not at all sure of that. If the paint is not conductive I am pretty sure this form of etching won't work.
Stainless is not chromed, so I don't think it would work with that. If it does I think the metal should stay the same color...but maybe more matte?
So...bottom line, I am not sure this will work on plates that have not been chromed. If anyone tries it please post, but I would not count on it working. I did my plate with the thinking that it was an experiment, and I try to keep in mind that it is the nature of experiments that sometimes they fail. ;-)
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