Eosin B is a readily water-soluble, red dye with a green fluorescence ( Lambdamax. 514 nm), which is commonly used in histology and microbiology. The dye binds in the acidic pH range (pH 2.5 – 3.5) to proteins. This complex absorbs light at 536 – 544 nm.

Biological Dye

C.I. 45400
Molecular Formula: C20H6Br2N2Na2O5
Molecular Weight: 624.08 g/mol
Absorption Wavelength
(@ Lambda Max): 515nm
Absorption Ratio: 1.22
Specific Absorbtion
(A1% in 10mm cell): 962
Loss on drying: <10%

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 548-24-3
Einecs No: 208-943-1