How to Nitre Blue Presented by Larry Potterfield | MidwayUSA Gunsmithing

Published on August 12, 2011
Duration: 1:30

This guide details the nitre bluing process for firearms parts, presented by Larry Potterfield of MidwayUSA. It covers essential steps from part preparation and degreasing to the precise dipping and monitoring required to achieve a beautiful, durable royal blue finish. The process involves heating specialized salts to 650°F and carefully immersing polished parts, followed by quenching and oiling for a lasting result.

Quick Summary

Nitre bluing firearm parts involves heating specialized salts to 650°F in a lead melting pot. Parts must be polished to a fine finish, degreased, and then dipped briefly, wiped with steel wool, and dipped again while monitoring color. Quench in water, repeat for all parts, oil, and cure for 24 hours.

Chapters

  1. 00:07Introduction to Nitre Bluing
  2. 00:16Equipment and Solution
  3. 00:26Part Preparation
  4. 00:40Initial Dip and Cleaning
  5. 00:50Second Dip and Monitoring
  6. 01:02Quenching and Repetition
  7. 01:10Final Steps and Curing
  8. 01:17Conclusion

Frequently Asked Questions

What temperature is required for the nitre bluing salts?

The nitre bluing salts need to be heated to approximately 650 degrees Fahrenheit in a lead melting pot. This precise temperature is crucial for the chemical reaction that creates the blue finish on the metal parts.

How do you prepare firearm parts for nitre bluing?

Before nitre bluing, all firearm parts must be meticulously polished to a very fine finish. They are then suspended with fine wire and thoroughly degreased to ensure the bluing solution adheres evenly and produces the best possible color.

What is the role of steel wool in the nitre bluing process?

Fine steel wool is used immediately after the initial dip into the hot nitre bluing solution. Its purpose is to wipe off excess bluing salts from the part, preparing it for the subsequent dip and color development.

How long does the nitre bluing process take?

The actual bluing of each part is very quick, often taking only seconds to achieve the desired color during the dips. However, the entire process, including preparation, multiple dips, quenching, and curing, can extend over a day.

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