Steve, sorry I misunderstood what you were saying.
koginam, thank you very much. This is what I love to do and when people enjoy my work it makes it even more satisfying.
rcmodel, it depends. Glock & HK slides are too hard to be worth trying to cut, except for laser or machine engraving. Stainless Rugers can be done but they are a pain. I send color cased parts out to be annealed. I work with a local 'smith that does CCH, or I'll send it to Turnbull. The other option is to polish through the case hardening which is a not fun at all. I was working on a Westley Richards SXS, a while back, that was once color cased and had been polished by someone else. The forend iron was still too hard to cut. My carbide tools just slide right across it so I heated it with a torch to a nice blue color, re-polished and heated to blue again. After that it was fine. I guess I should mention that annealing should only be done by a professional. It is very easy to ruin a part or cause safety issues if not done correctly.
After all the engraving and inlay work is done, they go back to get color cased again. I've got a shotgun on it's way to Turnbull right now.
David