I noticed that when I went to their website as I was going to try to locate a used Rodeo, polish the metal, then send the frame and hammer to them for case colors, then nitre blue the screws, the trigger, base pin and ejector rod. The trigger guard, barrel, ejector rod housing and back strap I would then do in rust blue. I know rust blue is not historically correct, but then again neither is hot salt tank modern bluing. Carbonia blue is close to the charcoal blue they are offering, but I would rather not spend the money on it. Rust bluing looks very good the way I do it. I can do everything myself except the case coloring and I can keep the savings for ammo components.