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Alizarin Red S (also known as C.I. Mordant Red 3, Alizarin Carmine, and C.I 58005. It is a water-soluble sodium salt of Alizarin sulfonic acid with a chemical formula of C14H7NaO7S.
A 1645 (OTTO) Alizarin red S Cas 130-22-3 - used on Thin sections, and polished surfaces to help identify carbonate minerals which stain at different rates.