Brownells Oxpho-Blue Cold Bluing 32Oz

Brownells Oxpho-Blue cold bluing is a rub-on bluing chemical designed for gunsmiths, hunters, and shooters who need to touch up, restore, or maintain firearm finishes without hot-bluing equipment. Unlike traditional methods that require extensive polishing and specialized gear, Oxpho-Blue works by chemically darkening steel through a simple dampened-cloth application—making it practical for field touch-ups, shop repairs, and full-gun restoration when you want professional results without the complexity.

The 32 oz bottle provides enough solution for multiple firearms or extended use on a single project. The formula penetrates through oil and surface contamination, simultaneously removing light rust and bluing the steel beneath, then leaves the metal protected and ready for standard gun oil. A key advantage: the finish doesn't rust after application. Careful work yields a durable, weather-resistant blue that actually outperforms other chemical finishes in real-world durability, and the finish resists wear from gun cases, clothing, and handling better than you'd expect from a cold-bluing product. Apply it with a dampened flannel cloth for quick touch-ups, or use a more deliberate approach with fine steel wool for a deeper, more refined finish.

Oxpho-Blue works on more than just firearms—it's equally effective on tools, instruments, and any blued steel that's showing bright wear. The solution's unique wetting properties let it work around dirt and grease without requiring aggressive pre-cleaning, which saves time on older guns or field repairs. Whether you're a professional gunsmith, a serious hobbyist, or a hunter touching up a worn stock gun in the field, this is one of the few cold-bluing products that delivers genuinely professional results.

Key Features

• Rub-on application—no specialized equipment or heating required
• Removes light rust and blues steel in a single step
• No after-rust; protective finish is ready to oil immediately
• Weather-resistant, durable finish that resists everyday wear and handling
• Works through oil and surface contamination—minimal pre-cleaning needed
• Applies with cloth, flannel, or fine steel wool for varying finish depth
• 32 oz bottle suitable for multiple firearms or extended projects
• Also effective on tools and other blued steel items

Specifications

Frequently Asked Questions

Can I use Oxpho-Blue on a gun I want to carry or hunt with?

Yes. The finish is durable and weather-resistant, and it resists wear from gun cases, clothing, and normal contact better than typical cold-bluing products. Once applied and oiled, it provides a protective finish suitable for active use. It won't match the appearance of a professional hot-blued gun, but it will look presentable and perform well.

Do I need to remove all rust and dirt before applying Oxpho-Blue?

No—one of Oxpho-Blue's main advantages is that it works through light rust, oil, and surface contamination. The chemical penetrates and removes mild rust as part of the bluing process, so you don't need the extensive pre-polishing required by other bluing methods. A quick dampen-and-rub is often enough for touch-ups.

How do I get the darkest, most refined finish?

Apply Oxpho-Blue with fine steel wool (No. 0 or similar) and rub vigorously. The more rubbing, the more brilliant and dense the finish becomes. You can build the blue to a point where water will actually bead up on the surface—a sign of a very complete, durable finish.

Does Oxpho-Blue work on tools and other metal items?

Yes. It's equally effective on any blued steel that's showing bright wear or rust, including gun parts, tools, and instruments. Simply dampen a cloth and rub the affected areas brightly, and they'll re-blue as dark as before but with added toughness.