Are you looking for:

John Gillette
Classic Guns
http://www.classicgunsinc.com/
1702 Dixie Hwy.
Crete IL 60417 United States
708-367-1620
Tuesday-Saturday 11 a.m - 5 p.m.
classicguns@clear.net

He comes highly recommended for case coloring. I'm not sure about removing the nickel but any plating shop should be able to do that for you.