title: Eosin Y
text: # Eosin Y
  
  Eosin Y, also called C.I. 45380 or C.I. Acid Red 87, is a member of the triarylmethane dyes. It is produced from fluorescein by bromination.
  
  ## Use
  
  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. Eosin Y is also widely used in the Papanicolaou stain (or Pap stain used in the Pap test) and the Romanowsky type cytologic stains. It is also used as a photosensitizer in organic synthesis.
  
  * Eosin Y solution for staining microscopy slides.
  * Eosinophilic staining, using eosin Y, compared to other patterns when using hematoxylin and eosin (H&E).
  