Birchwood Casey Super Blue Liquid GunBirchwood Casey Super Blue Liquid Gun Double strength blueing solution. For blueing highly polished steel parts and hardened steels containing nickel and chrome alloys (except stainless). Super blue extra strength gun blue is the blackest blue. A double strength blueing solution designed for blueing highly polished steel parts and hardened steels containing nickel and chrome alloys (except stainless). super blue extra strength gun blue is the blackest
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