I used both methods 20 years ago in several of my jewelry smithing classes for my minor. In my experimenting they tended to only produce an extremely thin and fragile coating. In most cases I was able to wipe it off. I'm sure with better voltage regulation and experimentation it might yield better results. I know I am experimenting with a salt water etching and reveresed polarity finishing step that is supped to etch brass and then when the polarity reversed, and you replace the scrap brass rod with an iron rod, pull the copper to the surface of the etched portion of the brass. Still trying to get it right though.
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