Light micrograph of a thin section of brass. Brass is an important alloy, containing mainly copper and zinc with not more than 5% of other metals. The zinc content varies from 20% for cold-worked brass to 45% for hot-worked brass. Its major uses are in electrical fittings, ammunition cases, screws, household fittings and ornaments. Magnification: x62 at 6x4.5cm size.
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