We are proud to offer the Oxpho Blue Liquid, a gun bluing solution used to impart a protective blue-black finish on gun parts. Originally developed for the occasional bluer who is not equipped to completely polish a gun prior to bluing, Oxpho Blue - because of its ease of application and remarkably superior results - has become a favorite of the professional gunsmith as well. The chemical goes through the oil on the gun, removes thin rust and blues the steel underneath. No after-rust. For looks, the final finish was not intended to approach the beauty of the well-polished, hot-blued gun. It has developed, however, that in the hands of a careful craftsman, not only is the Oxpho-Blue finish beautiful, but it is also more durable and weather resistant than any other known chemical. Oxpho Blue Liquid is made with a combination of chemicals including copper nitrate, nitric acid, and other proprietary compounds. The solution is applied to the gun parts using a cotton swab or other applicator and allowed to react with the metal surface. The result is a deep blue-black finish that is highly durable and long-lasting. This is one of the best products, we ever offered and based on the last three years, it is a popular choice for gun enthusiasts looking to protect their firearms and achieve a high-quality finish!