74 



Biological Stains 



Very little mention has been made of this dye in the biological 

 literature but it has been called for by Dublin (1943) with "ponceau 

 de xylidine" as one step of the Bodian stain in neuropathology. 



I 1 



I I I 



640 



• J 



700 



WAVELENGTH m >* 



Fig. 7. Spectral curves of three azo dyes: 

 1. Orange G. 2. Methyl orange. 3. Orange II. 



c21 



SORBINE RED 



C. I. NO. 54 



Synonyms: Azofuchsin SB. Kiton red S. Eriorubine G. Azo 



acid red L. Azo rhodine 3G. 



CHjCO NH. 



OH 



N_N_/\ 



NaSOs NaSOs 



Ci8Hi3N308S2Na2; Mol. Wt. 509.422 

 {An acid dye: absorption maxima about [5^5], 4-99) 



