Nitro and Azo Dyes 



73 



A spectrophotometric graph of this dye, compared with two 

 other orange dyes, is given in Fig. 7, page 74. 



PROCEDURES RECOMMENDED BY THE COMMISSION IN WHICH THIS STAIN IS USED 



cl6 



CHROMOTROPE 2.R 



C. I. NO. 19 



Synonyms: Chromotrope N2R. Chromotrope blue 2R. Fast 

 fuchsin G. XL Carmoisine 6R. Acid phloxine GR. 



NaSOj SOiNa 



Ci6HioN208S2Na2; Mol Wt. 468.370 



{An acid dye; absorption maxima [5j^2] 503) 

 Solubility at 26°C: in water 19.3%; in alcohol 0.17% 



This dye has recently been employed by Lendrum (1935) as a 

 counterstain to celestin blue in animal histology. Lillie (1940) 

 finds it is a fairly good substitute for "xylidine ponceau" in the 

 Masson (1929) trichrome stain. Crossmon (1940) uses it in the 

 selective staining of red blood cells in sections. 



cl9 AZOPHLOXINE GA C. I. NO. 3 1 



Synonyms: Fast crimson GR. Amidonaphthol red G. 



OH NH COCH3 



I I 



N_N 



NaSOs S03Na 



Ci8Hi3N308S2Na2; Mol. Wt. 509.422 

 (An acid dye; absorption maxima 540 , 502) 



