A bright red synthetic dye used to stain cells and tissues in microscopy, making them visible under a microscope for scientific study.
From Greek 'eos' (dawn/rosy light) because the dye produces a characteristic rosy-red color reminiscent of sunrise; named in the 1870s by German chemists.
Eosin is one of the most important tools in medical diagnosis—pathologists have been using it for 150 years to stain tissue samples pink-red, and it's still essential in every hospital laboratory today.
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