517-28-2-Hematoxylin5 Hematoxylin Synonym: Natural Black 1, Hematoxylin Stain CAS Number: 517-28-2 Dye Content: Min. 95% Empirical Formula (Hill Notation): C16H14O6 · xH2O Molecular Weight: 302.28 (anhydrous basis) Physical Form: Powder Packaging: Glass Bottle Certified