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Doug is the master of color case-hardening, and for many years a key arm of his Turnbull Manufacturing Company (www.
The Ultimate from American Western Arms features a very nicely high-polished blue mated up with hammer and main frame finished in a bone and charcoal color case-hardening--real case-hardening not coloring as on many replicas.
Gas carburizing using atmospheric pressure treatment in gas-fired or electrically heated furnaces is now the most popular case-hardening method.