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Orichalcum is an ancient metal described as a golden-yellow alloy primarily made of copper and zinc, essentially a high-quality form of brass. It closely resembled gold in color but was less valuable and was used by the Romans for making coins. The metal was historically noted for its strength, malleability, and resistance to tarnishing. Ancient Greek writers, including Plato, regarded it as highly valuable, second only to gold. Orichalcum was said to be mined in Atlantis according to Plato's dialogues, but by his time, it was known only by name. Modern discoveries in a 2,600-year-old shipwreck off Sicily confirmed that orichalcum ingots were composed mainly of copper and zinc with small amounts of other metals, matching the properties of brass.

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