Eosin Y is a synthetic dye commonly used in histology and microscopy. It is a red fluorescent dye that stains proteins and cellular structures, making it easier to visualize tissues under a microscope. Eosin Y is often used in combination with hematoxylin, another dye, to create a contrasting color scheme that highlights different components of biological samples. In addition to its use in laboratory settings, Eosin Y is also employed in various industries, including textiles and cosmetics. Its ability to impart vibrant colors makes it a popular choice for dyeing fabrics and formulating products like soaps and lotions.