Phenyl Methane Dyes 



161 



nic crystal violet has been specified instead of gentian violet for 

 some special procedures. Worth noting is Benda's crystal-violet- 

 alizarin method for staining chondriosomes, and its modifications 

 by Meves and Duesberg (1908); and also its use in combination 

 with erythrosin by Jackson (1926) for staining lightly lignified 

 walls, in which technic it proves more uniform than gentian violet. 

 A loose compound of crystal violet and bismuth, formed by 

 treating an aqueous solution of the dye with an aqueous solution 

 of bismuth ammonium citrate, has been prepared by Wilkinson 

 and Barksdale (1928) and called bismuth violet. It is claimed to 

 have much greater bacteriostatic action on Gram-positive bacteria 

 than crystal violet itself. 



PROCEDURES RECOMMENDED BY THE COMMISSION IN WHICH THIS STAIN IS USED 



n35 ethyl violet C. I. NO. 68l 



Synonym: Ethyl 'purple 6B. 



Ethyl violet is hexa-ethyl pararosanilin having the following 

 formula: 



C2H5 



CI 



I 

 C,H5-N_/ 



I N 

 C2H5 



N 



N 



C2H5 

 C2H5 



C0H5 



C31H42N3CI; Mol. Wt. 492.127 

 {A basic dye; absorption maximum about 596) 



