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Cartridge brass consists of 70% copper and 30% zinc. Personally, I think you should listen to a chemical engineer and not use Brasso: "It's the copper in the alloy that ammonia dissolves: "Attack takes the form of reaction between ammonia and copper to form the cuprammonium ion, formula [Cu(NH3)4], a chemical complex which is water-soluble, and hence washed from the growing cracks". Just saying.
Don
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NRA Life Member
NRA Certified Metallic Cartridge Reloading Instructor
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