Used primarily in histology and cytology for staining biological tissues, this solution imparts a pink to red color to cytoplasmic components and extracellular structures. It serves as a counterstain in H&E (hematoxylin and eosin) staining, one of the most common techniques in microscopic examination of tissue sections. The eosin-stained sections allow clear visualization of cellular morphology, making it essential in diagnostic pathology, especially in cancer detection and tissue analysis. It is compatible with aqueous and permanent mounting media and works effectively with automated and manual staining procedures. Commonly used in research laboratories, hospitals, and educational institutions for routine tissue examination.