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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/3340927

A pile of silicon carbide, grade 60 mesh (grain size about 0.25 mm (0.0098 in)). The picture is focus stacked from eight photos. Original public domain image from Wikimedia Commons

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A pile of silicon carbide, grade 60 mesh (grain size about 0.25 mm (0.0098 in)). The picture is focus stacked from eight photos. Original public domain image from Wikimedia Commons

More