eosin

noun1

1. •
   A red, acidic dye commonly used in histological stains.

   • Eosins are acid xanthene or phthalein dyes. Eosin Y, eosin B, phloxine and erythrosin (which unlike other eosins, is halogenated with iodine), are the common members of this group of dyes. — 2000