Brownells Formula 44/40 Instant Cold Blue 2oz (12-Pack)

Brownells Formula 44/40 Instant Cold Blue is a fast-acting cold bluing solution for touch-ups, repairs, and refinishing metal firearm surfaces. Applied without heat, it produces a deep, even blue-black finish on steel. This listing includes a 12-pack of 2oz bottles, making it ideal for professional gunsmiths or high-volume shop use. Compatible with most steel firearms and components.