Do you think it will work on this..?

http://www.gunbroker.com/Auction/Vie...Item=214479006

LOL... No. :D

another vid on the same subject <click

John: I did a quick test on the electrolytic method on an S/42 frame and the cylinder of a S&W Model 19. I didnt notice any effect on the caustic bluing, but the bare metal did appear a little brighter. I didnt pursue the experiment for very long because I was trying to remove the bluing. If I refinish a rust blued pistol, I'll let you know what happens.
John

How to Copper Plate Your Luger
 

I tried the rust removal technique on what I believe were a couple salt-blued parts and got results that were ah interesting on the first try and excellent on the second.

I have a shooter with a blued s-link and decided to remove the blue with the electrical method of this thread. I followed the instructions, including using steel (a screw) for the positive connection. After 5 minutes in the bath, I inspected the part and the blue seemed to be coming off.

To complete the process and improve matters, rather than use a steel screw I decided to use about 2" of copper wire, as we all know that copper is a good conductor. I substituted the copper for the steel screw and let the process go for about 15 minutes.

Before and after pictures below.

It was not my intent to copper plate anything so I was quite astounded to discover the plated the s-link. Fortunately the copper was quite thin and easily removed via 220 grit sandpaper. It appears the blue was replaced by a very thin layer of copper. The part looks ok after sanding off the copper to the bare metal. As it goes into a shooter, no harm done.

Having learned my lesson, I repeated the process with a trigger bar on a different shooter. Being careful to use steel for the positive connection. After about 30 minutes I was pleased with the result.

So I conclude the process does remove blue, and that you should use steel not copper for the positive connection. While I am not a chemist (obviously), I've read that both rust blue and hot blue techniques create the same surface coating on the metal; therefore I would expect this technique to remove both types of bluing.