Product Description Birchwood Casey Perma Blue Liquid Product Details Firstly, a double strength blueing solution designed for blueing highly polished steel parts and hardened steels containing nickel and chrome alloys (except stainless). Birchwood Casey Perma Blue Liquid is the blackest blue. Additionally, use caution to confine the solution to the area to be reblued, as it will have an effect on the existing blue. Size • 3 fl oz
