Mill scale

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Notion

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Science and technology

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What Wikipedia says

Mill scale, often shortened to just scale, is the flaky surface of hot rolled steel, consisting of the mixed iron oxides iron(II) oxide (FeO, wüstite), iron(III) oxide (Fe2O3, hematite), and iron(II,III) oxide (Fe3O4, magnetite).

Excerpt from the Wikipedia article “Mill scale”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: indeedous, Attribution, via Wikimedia Commons.