That is correct and then it is cooled rapidly by dipping it into oil. But I've also heard of surrounding it with other material. The oil dipping is what case hardens it and the material is what gives it a certain color and pattern. I believe the case hardening only hardens the very outer part of the metal so the inner metal stays softer. They do this because they want the outer material to withstand dings but not let the inside to become too brittle.Travlin wrote:I believe true color case hardening is done while the part is heated surrounded by bits of bone and and burned leather. When Colt started making the S.A.A. after several years of non production, they had to call back some retired workers who knew the process.
At least that is what I've been told. I've never done it but have heard of home kits where you can do it at home. I think it only works on steel. Has anyone here actually tried it?
