Minium powder. Minium is lead oxide (rust). It forms by oxidation of primary lead ores, such as galena (lead sulphide) and is almost always powdery wi

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Minium powder. Minium is lead oxide (rust). It forms by oxidation of primary lead ores, such as galena (lead sulphide) and is almost always powdery with a yellowish red color. Minium is used as a pigment in paints and dyes, but health concerns about lead have reduced this use.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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