Formalin-zinc acetate solution is primarily used in histopathology and cytology for the fixation and preservation of tissue samples. It helps maintain cellular structure and morphology, ensuring accurate microscopic examination. The solution is particularly effective in preserving delicate tissues and preventing autolysis or decomposition. It is commonly employed in medical laboratories for preparing tissue specimens for diagnostic purposes, such as identifying diseases or abnormalities. Additionally, it aids in staining processes by enhancing the visibility of cellular components under a microscope. This solution is also utilized in research settings for studying tissue architecture and cellular details in biological studies.