Hematein is widely used as a biological stain in histology and microscopy. It is a key component in hematoxylin-eosin (H&E) staining, a common technique for visualizing tissue structures. Hematein binds to cell nuclei, highlighting them in blue or purple, which helps in identifying cellular details and diagnosing diseases. It is also employed in cytology to study cell morphology and in pathology to detect abnormalities in tissue samples. Additionally, hematein is used in research laboratories for studying cell and tissue architecture. Its staining properties make it a valuable tool in medical diagnostics and biological research.