Eosin is a synthetic dye commonly used in histology and microscopy to stain biological tissues. It is particularly effective in highlighting cellular structures, making it easier to observe under a microscope. Eosin typically imparts a pink or red color to tissues, allowing for better differentiation of various cell types and components. This dye is often used in conjunction with Hematoxylin, another stain that colors cell nuclei blue. Together, these stains provide a clear contrast, helping pathologists and researchers analyze tissue samples for diagnostic purposes. Eosin is widely utilized in medical laboratories and research settings.