Fast Red 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 Fast red B Fast red B Fast red salt B 37125 Azoic diazo 5 Diazonium salt – 20% – 375 Yellow C17H13N3O9S2 467.4

Fast red B is a diazonium salt often recommended for demostrating enterochromaffin in carcinoid tumours. During the coupling process an azo dye is formed which is red-orange.

 

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

Burstone, M.S.
Enzyme Histochemistry and its application to the study of neoplasms
Academic Press, New York, NY, USA

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