BORDEAUX RED C. I. NO. S8 



Synonyms: Fast red B or P. Cerasin. Archelline 2B. 

 Azo-hordeaux . Acid bordeaux. 



Various grades denoted: Bordeaux B, BL, G, R extra. 



N = N 

 HO" 



NaSO,, SO,Na 



{An acid dye; absorption maximum about 520) 



Bordeaux red is used as a cytoplasmic stain, in particular when 

 Heidenhain's haematoxylin is to be used immediately afterward 

 as a nuclear stain. It has also been used by Graberg with thionin 

 and methyl green for staining sections, particularly of spleen, 

 testis, and liver. 



JANUS GREEN B. C. I. NO. 133 



Synonym: Diazin green. 



This is an azo dye having an azin as well as an azo chromophore 

 group, and is thus related to the safranins. It is a compound of 

 diethyl safranin with dimethyl anilin thru an azo group. 



CH3 

 CH3 CH3 / 



Y^rVY rYY 



/\/ N \/\ /\/ CH3 



H.N / \ N = N 



CI 



(A basic dye; absorption maximum about 592.7) 



Janus green is best known for its use in demonstrating chondrio- 

 somes, stained intra vitam, according to the technic of Michaelis, 

 and as more recently developed by Cowdry and Bensley. It is 

 also used by Faris with neutral red for sections of embryos. 



FAST YELLOW C. I. NO. l6 



{Echt Gelb) 



Synonym: Acid yellow. 

 N = N SOjNa 



NaSOj NHa 



{An acid dye; absorption maximum about 4.90 in acid solution) 



35 



