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Eosin comes from Eos, the name of the mythological Greek goddess of the dawn (Aurora in Latin), whose rising was accompanied by the red colour of the dawn sky.[1]

A red dye. There are 2 forms of eosin, Eosin B and Eosin Y. Eosin B is the dibromo-, dinitro- derivative of fluorescein, while Y is the tetra-brominated form of fluorescein.

It is used in combination with haematoxylin in the common histological stain, haematoxylin and eosin.