Eosin Y (yellowish), Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
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Synonyms: Tetrabromofluorescein disodium saltEosin Y disodium saltEosin 2252′,4′,5′,7′-Tetrabromofluorescein disodium saltSolvent Red 43Disodium 2-(2,4,5,7-tetrabromo-6-oxido-3-oxoxanthen-9-yl)benzoateDisodium 2',4',5',7'-tetrabromo-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-3',6'-bis(olate)Field's Stain B2,4,5,7-Tetrabromofluorescein disodium salt

M-Clarity™ quality level = MQ200

E6003-25GEA 22.1 GBP
E6003-25G E6003-250G E6003-100G
Eosin Y (yellowish), Sigma-Aldrich®
Eosin Y (yellowish)

Dye content - ≥85%.


Eosin Y disodium salt has been used for determining sperm viability. The swollen and stained spermatozoa were considered dead. In corneal epithelium, it has been used in the procedure of immunohistological staining. Eosin Y is a xanthene dye and is used for the differential staining of connective tissue and cytoplasm. In histopathology, it is applied as a counterstain after hematoxylin and before methylene blue. It is also used as a background stain, thereby giving contrast to the nuclear stains.

Formula: C₂₀H₆Br₄Na₂O₅
MW: 691.86 g/mol
Melting Pt: 255...270 °C
Density: 1,018 g/cm³
Flash Pt: 191,6 °C
Storage Temperature: Room Temperature
MDL Number: MFCD00005040
CAS Number: 17372-87-1
EINECS: 241-409-6
Merck Index: 13,03634

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Specification Test Results

Appearance (Form) Powder or Crystals
Infrared spectrum Conforms to Structure
Solubility (Colour) 1 mg/ml H₂O Orange to Very Dark Orange and Red to Very Dark Red and Orange-Red and Red-Orange
Solubility (Turbidity) Clear
Dye Content ≥85%
pH 6.55 (29 °C, 84 °F)

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