+Slag is a glassy material, a byproduct formed during the [smelting](/wiki/smelting) of ore to extract desired [metal](/wiki/metal). It floats atop the molten mass, separating impurities and protecting the refined product.
+## See also
+- [Iron](/wiki/iron)
+- [Steel](/wiki/steel)
+- [Foundry](/wiki/foundry)
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