Birchwood Casey Spanish Super Blue Features Birchwood Casey Spanish Super Blue is a double-strength bluing solution designed to produce deep rich color on highly polished steel firearm parts. The formula is built to work effectively on hardened steels including those containing nickel and chrome alloys giving it broader application than standard bluing solutions. Because the solution is not intended for stainless steel users should confirm the metal type before application to achieve the best results. The 90ml bottle provides enough solution for multiple small refinishing projects or touch-up work on an existing blued finish. Known for producing the blackest blue in Birchwood Casey s lineup Spanish Super Blue is a favorite among gunsmiths and hobbyists who want a deep classic finish on polished steel. The liquid format allows for controlled application to small parts pins and other components during a refinishing project. This bluing solution is part of Birchwood Casey s long-standing line of firearm finishing products built for both professional and home use. For anyone refinishing or touching up polished steel gun parts Birchwood Casey Spanish Super Blue is available for sale at GrabAGun. Birchwood Casey Spanish Super Blue Specifications Manufacturer: Birchwood Casey Model: Spanish Super Blue Type: Liquid Gun Blue Size: 90ml Usage: Polishing/Refinishing Available At: GrabAGun