gunmetal (casting bronze)

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Scope note
Casting bronze, of from 10 to 15% tin, about 2% zinc, and the balance copper; formerly used for making cannon barrels, and later also for a variety of machine components and other devices. Also any of several metals or alloys of a dark bluish or purplish gray, used to make firearm barrels and other objects.
gunmetal
Accepted term: 18-Nov-2024