Birchwood Super Blue Liquid Gun Blue is designed for blueing high polished steel parts and hardened steels containing nickel and chrome alloys (except stainless). Super 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.
Specifications:

Type	Gun Blue
Size	3 oz
Quantity	1
Bristle Type
Length
Includes
Material
Tip Feature
Battery
Thread Pattern
Protects
Suitable For
Eco-Friendly