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@libroraptor oh yes. Cast iron is often 5% or more carbon.

The real fun one with archeologists, is brass. Call something brass or bronze and you start to see steam. Bronze is copper + tin. Brass is copper + zinc. But often you get copper + zinc + tin. Is that a bronze with zinc, or a brass with tin. So it tends to just be called copper alloy... Metallurgy is amazing.

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