It is the same finish that colt uses on their saas. The firing pin offers full service gunsmithing and firearm refinishing, specializing in color case hardening or case color hardening (w/bone & charcoal), hot bluing, rust bluing and rust browning. Pin On Guns In a nutshell, color case hardening is basically carburizing (adding carbon to the surface of the steel) and hardening steel. Color case hardening services . We keep our temperatures below hardening temperatures. We are a two man gunsmith shop concentrating on color hardening. Total price for hand finishing all metal, color case hardening and bluing to original colors.please call for quote. Initially, it required the bone charcoal to be warmed up to a specific temperature. Ruger lcp, lcp ii, ec9 are the only eligible pistols in this category at this time; We share your passion for the outdoors and for beautiful case hardened guns. It is a process of heat treating mainly. We can be reached at 1. Our color...