Eosine I Bluish
Title: Eosine I Bluish
CAS Registry Number: 548-24-3
CAS Name: 4¢,5¢-Dibromo-3¢,6¢-dihydroxy-2¢,7¢-dinitrospiro[isobenzofuran-1(3H),9¢-[9H]xanthen]-3-one disodium salt
Additional Names: 4¢,5¢-dibromo-2¢,7¢-dinitrofluorescein disodium salt; hydroxydibromodinitro-o-carboxyphenylfluorone sodium; C.I. Acid Red 91; C.I. 45400
Molecular Formula: C20H6Br2N2Na2O9
Molecular Weight: 624.06
Percent Composition: C 38.49%, H 0.97%, Br 25.61%, N 4.49%, Na 7.37%, O 23.07%
Literature References: Prepd by nitration of 4¢,5¢-dibromofluorescein: Colour Index vol. 4 (3rd ed., 1971) p 4427.
Properties: Red powder. Freely sol in water with green fluorescence; sol in alc.
Use: Dyeing wool, cotton, and paper. In histology as a stain for epithelia, muscular fibers, nuclei, etc.

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