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• 16:19, 26 April 2026 MDerrick talk contribs created page Acid Red 87, CI 45380, Eosin Y, LC (Created page with "== Usage History == A red crystalline dye composed of the potassium, sodium, or lead salt of tetrabromofluorescein. First discovered by Heinrich Caro, a German chemist, in 1874, eosin was initially used as an acid dye for producing a blood red color in textiles (silk, wool, paper, leather, and cotton). It has also been used as a cosmetic colorant, a colorant in red inks and an iridescent ceramic glaze. In the late 19th and early 20th century, eosin was used as...")