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Understanding Brass, Bronze and Patina
Brass
Brass is a buttery yellow alloy which has been manufactured for thousands of years all over the world. The uses of brass vary depending on the percentages of zinc and copper, and which other metals have been added to alloy to bring out specific properties, but they include cartridge cases for weapons, pipes, decorative accents on homes, musical instruments, and household ornaments. The color of the alloy will also vary, depending on the amount of zinc: brass gets lighter in color with additional zinc, and can reach a pale yellow stage.
Basic brass has approximately 67% copper and 33% zinc, making it stronger and more durable than copper, although not as strong as metals like steel. Alloys with even less zinc start to turn reddish in color, and are sometimes called red brass. Other metals are sometimes added to the alloy including lead to make brass more workable by machine and to resist corrosion, and iron to make the brass harder and easier to forge.
Numerous terms are used to talk about brass including “cartridge brass” and “Dutch brass,” but in the United States, brass is assigned a number under the Unified Numbering System. All br
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