Please wait one more day. The choice of materials will be explained. I have no experience with hot bluing, but the rifle that bothers me because it looks falsely new was hot blued by a professional. He did it well, but it just looks too new for a 100 year old rifle, although that is indeed how they were usually finished - the kind of "blue" that looks black, of course. And color case-hardening is NOT appropriate for military rifles.