I once read an article in an English gun magazine about case hardening. A gun maker was asked to apply case hardening to an action and his reply was the question "Do you want it pretty or do you want it durable?" The deeper the case hardening, the duller the colors and the greater the wear properties.
It's my understanding that on their Vicaro revolver frames, Ruger uses a process to apply colors that simulate color case hardening but it isn't. Bone charcoal isn't used in the process at all.
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