Used in cytology for staining cellular specimens, particularly in Pap smears, to detect cervical cancer and other abnormalities. The kit differentiates cell components clearly—nuclei stain dark blue to black, cytoplasm shows varied colors depending on cell type, and keratin appears red or pink. This contrast enables accurate microscopic evaluation of cellular morphology. Widely applied in diagnostic laboratories and screening programs to improve early detection of precancerous and cancerous lesions in gynecological samples. Also used in research and non-gynecological cytology for examining fine needle aspirates and body fluids.