Methods and Strategies: Self-Made Fire Blueing
Fire bluing, a technique dating back to the 16th century, is a popular method for adding a unique, 'peacock' blue finish to small parts of firearms. This traditional process is now easily accessible for today's hobby gunsmiths.
The process involves heating a carbon steel part between 590°F and 640°F, causing it to change colour from light yellow to deep purple and finally blue. To achieve this, a propane torch, a cup of water, and a little oil are required. Quenching the part in water during the process prevents the temperature from rising further, ensuring the ideal conditions for fire bluing.
Before application, the parts should be polished to at least 600 grit for the best results. The finer the polish, the deeper and more lustrous the blue finish will be. After the part has been heated and quenched, it's essential to apply oil to the cooled part to prevent rust. Dropping the parts in used motor oil for a few minutes is a common method for oil application.
Fire bluing forms a thin oxide layer on the part. This layer allows light to pass through it, reflecting off both the upper and lower surfaces of the layer, giving the part its distinctive blue colour. This process is not suitable for large areas of firearms due to the time-consuming nature of the process.
Fire bluing can add a touch of authenticity to a historical reproduction or a touch of class to an otherwise ordinary field gun. It's still used on some of today's high-end custom arms. David Stavlo from Lodgewood Mfg. suggests re-assembling the gun after fire bluing and oiling for the best results.
It's important to note that if the part's temperature rises above 650°F during fire bluing, it will turn from a bright blue to a dull gray. Therefore, careful temperature control is crucial during the process.
While the origins of the article on 'Fire bluing' are unclear, the technique's enduring popularity among gunsmiths attests to its effectiveness and appeal. Whether you're a seasoned gunsmith or a beginner, fire bluing is a skill worth mastering for adding a touch of history and style to your firearms.
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