Carbonia blue, furnace blue? I had several parts finished by Classic guns Inc. back in the day using this process. The color of the finished parts was a very deep and shiny black, very attractive. The parts were highly polished and looked like mirrors. With all that said...I saw very little difference in these parts compared to other parts that I had blacked using good quality bluing salts. Durability of the finish also goes in favor of high quality hot blue using high quality fresh salts. The carbonia blue was also much more expensive.
Dustin
