Carbona blue I have had John do for me in the past as well. The original process for Carbona involved a rotary gas furnace and oil as well as charcoal. It was a patented process develop by the American Gas Furnace co. I am not sure what John's process is. It gives a different color than true charcoal blue, more of a blue/black but very attractive. Carbona and charcoal are two different finishes but both utilize bone charcoal, only carbona uses oil.

Last edited by SKB; 03/19/18 11:42 AM.
http://www.bertramandco.com/
Booking African hunts, firearms import services

Here for the meltdowns