Birchwood Casey Spanish Perma Blue Features The Birchwood Casey Spanish Perma Blue Liquid Gun Blue comes in a 90 ml bottle providing a liquid cold bluing solution that chemically converts bare steel to a dark blue-black finish matching traditional factory bluing. This formula is specifically suited to touching up small scratches holster wear and minor blemishes rather than refinishing an entire firearm. The liquid application method allows precise control letting the user target only the affected area without disturbing the surrounding original finish. Birchwood Casey has built its reputation in the firearm maintenance space on products exactly like this one trusted by gunsmiths and hobbyists alike. Keeping a bottle of Perma Blue on hand lets firearm owners address cosmetic wear as soon as it appears rather than letting bare steel sit exposed to moisture and corrosion. The touch-up process is straightforward requiring only basic degreasing and application steps that most owners can perform at home. This 90 ml size is practical for the occasional touch-up rather than a full-scale refinishing project. The Birchwood Casey Spanish Perma Blue Liquid Gun Blue is a useful addition to any firearm cleaning and maintenance kit. Birchwood Casey Spanish Perma Blue Specifications Manufacturer: Birchwood Casey Model: Spanish Perma Blue Type: Liquid Gun Blue Net Volume: 90 ml Available At: GrabAGun