I have several Erma pistols, made in Germany between the 60's and late 90's. Some more than others, cast Zamak parts abound--the frames, at the very least, if not the uppers and some parts of the action. My question is, does anyone know of an appropriate chemical or electrolytic process that would impart a new finish to this material? I'd prefer not to paint, coat, or bake on a finish because the markings have minimal depth already, which will decrease if the zinc alloy is sanded, filed, or buffed to clean it up for the new finish. No, I'm not going to glass bead it, either--for the same reason, and that it's shiny/smooth now, and I'd prefer not to change the surface texture, or add to it. One thing I've heard is that cold bluing, heated to about 180 deg., and pre-heated parts put into it will result in an acceptable blackening of the zinc. Anodizing may work, I've also heard, as there may be enough aluminum in the mix to make the process successful. Black chrome would be an option, but who does it, ala FFL? I've considered Cerakote, but this project does not warrant such an expense. Has anyone successfully refinished a cast zinc gun?