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