Electrolysis Rust Removal

[Michael Kitterman]

I have done this process many times on parts and restored many old cast iron skillets, simple to do and really works quite well.

[Mike Poindexter]

I know (without truly understanding) this attacks only the rust (assuming no other metals in the tank) and I've seen the vinegar soak method as well. My question is does this have any effect on the case colors? What about the vinegar (acid) method? I understand neither method will affect the molecular hardening, but am not sure about the colors. I'm thinking Parker top levers, S&W hammers, LC Smith side plates, etc. Thanks.