Cresyl Fast Violet powder is a basic violet dye used as a histological stain. It is CAS number 548-62-9, with a chemical formula of C26H26N2Cl2O4 and a molecular weight of 495.36 g/mol. It is widely used in histopathology and microbiology laboratories for staining cell and tissue samples. Common uses include staining of mast cells, acid mucopolysaccharides and cartilage. For more information, please refer to the PubMed link https://pubmed.ncbi.nlm.nih.gov/11605936/.