Blue Wonder Gun Blue is a proprietary two-part solution. The first solution chemically bonds the ingredients to the surface of the steel. The second solution chemically activates and colors the bonded surface, much like developing a photograph. Blue Wonder applies quickly and easily with outstanding results. It looks and wears like "hot" blue. Kit Includes: 2 fl oz Gun Bluing Solution (enough for approximately 4 long guns)1/2 fl oz Gun Bluing Developer (enough for approximately 4 long guns)1 fl oz Gun Cleaner1/2 oz XFR LubricantNotes:Metal must be heated with a propane torch or hairdryerApplies a "factory-like" blue.Will not affect existing blue; only adheres to bare metal.Contains selenious acid, phosphoric acid, gold, silver, copper and nickel.Not for use on aluminum, stainless steel or zinc alloys.