Eosin Y, also called C.I. 45380[1][2] or C.I. Acid Red 87,[2][1] is a member of the triarylmethane dyes. It is produced from fluorescein by bromination.[3]
Eosin Y is commonly used as the red dye in red inks.
It is commonly used in histology, most notably in the H&E (Haematoxylin and Eosin) stain.[1] Eosin Y is also widely used in the Papanicolaou stain (or Pap stain used in the Pap test) and the Romanowsky type cytologic stains.[1][2] It is also used as a photosensitizer in organic synthesis.[4]
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