Eosin B

Property Data
Common name
Suggested name
Other names
 
C.I. number
C.I. name
Class
Ionisation
Solubility aqueous
Solubility ethanol
Absorption maximum
 
 
Colour
Empirical formula
Formula weight
Eosin B
Eosin B
Eosin bluish
Imperial red
45400
Acid red 91
Fluorone
Acid
39%
0.75%
516-519 (Conn)
514, 395 (Aldrich)
515 (Gurr)
Red
C20H6N2O9Br2Na2
624

Eosin B is sometimes used instead of Eosin Y ws in staining techniques. It is completely interchangeable, but gives a barely noticeable bluish cast instead of the yellow cast of Eosin Y. It is commonly used to compound Romanowsky stains.

The free radical of this dye, eosinol B, can be made from eosin B by treatment with hydrochloric acid. It is sometimes called eosin B, spirit soluble.

Compare the structural formulae of some eosin homologues.

 

Reference
R. D. Lillie.
Conn's Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A.

Aldrich chemical catalogue, 1992
Aldrich Chemical Company, Milwaukee, WI, USA.

Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.

Susan Budavari, Editor, (1996)
The Merck Index, Ed. 12
Merck & Co., Inc., Whitehouse Station, NJ, USA

 


 

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