A red fluorescent dye that is a bromine derivative of fluorescein, or one of its salts or other derivatives.
- The sections were then counterstained in eosin, dehydrated, cleared, and mounted with glass coverslips.
- The sections were counterstained with hematoxylin and eosin.
- Eosin Y is an anionic or acid dye in spite of the fact that a solution of the sodium salt of eosin is basic in reaction.
Late 19th century: from Greek ēōs 'dawn' + -in1.
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