Widely used in histology and cytology for staining cell specimens. Provides a bright pink to red coloration of cytoplasm and extracellular proteins, enhancing contrast in tissue sections. Commonly used in combination with hematoxylin in the H&E staining method, one of the most routine diagnostic techniques in pathology. Its alcohol solubility allows for quick penetration and uniform staining in dehydrated tissue samples. Also used in blood smear analysis and microbiology for differential staining of cellular components. Suitable for both manual and automated staining procedures due to its stability and consistent results.