A double-strength blueing solution designed for highly polished steel parts and hardened steel containing nickel and chrome alloys. Super Blue will provide a dark black-blue. Can be applied with a swab or q-tip. Will not blue stainless steel, alloy or nonferrous metals. 3 oz liquid. * I also have Birchwood Casey "Blue and Rust Remover Liquid" listed. * I also have Birchwood Casey "Aluminum Black" listed. one courier cost to courier any two together.