Birchwood Casey

BIRCHWOOD CASEY SUPER BLUE LIQUID GUN BLUE 32 OUNCE PLASTIC QUART #13432 A double-strength blueing solution designed for blueing highly polished steel parts & hardened steels containing nickel & chrome alloys (except stainless). Super Blue Extra Strength Gun Blue is the blackest blue. Use caution to confine the solution to the area to be reblued as it will have an effect on the existing blue.