CI 



I 



H 



/ 



/ 

 "X^C 



/ 



H 



\/' 



N 



' / ■ 



N 



\ 

 H 



{A basic dye.) 



The dyes known to commerce are mixtures of the higher and 

 lower homologs of this series. The higher homologs, on account of 

 the presence of ethyl groups and the higher molecular weight re- 

 sulting therefrom are a very deep violet. 



Hoffman violet has been used by Ehrlich and by Unna for stain- 

 ing mast cells; and by Juergens for staining amyloid, which stains 

 red, while the cytoplasm is colored blue. 



METHYL VIOLET 



C. I. NO. 680 



Synonyms: Dahlia B. Paris violet^ Pyoktanin blue. 



Gentian violet. 



Various shades denoted: Methyl violet 3R, 2R, R, B, 2B, 3B, 

 BBN, BO, 3V. 



The various dyes denoted methyl violet are mixtures of tetra-, 

 penta-, and hexa-methyl pararosanilin : 



H CI 



\l 



/ " 

 H 



CH, 



CH3 

 C CH, 



N 



_/ \ 



CH3 



tetra-methyl pararosanilin 



CH3 CI 



CH, 



penta-methy] pararosanilin 

 66 



