Phenyl Methane Dyes 147 



n2 Pararosanilin (Magenta O) c. i. no. 676 



Synonyms: Basic rubin. Parafuchsin. Paramagenta. 



This compound is triamino-triphenyl-methane chloride. 



H CI /"~\_NH. 



\ I ,_, /\_/ 

 N=/^\=C _ 



/ \_/ \/ \_NH3 

 H \_/ 



CgHisNsCl; MoL Wt. 323.815 



{A basic dye; absorption maximum about 5^) 



Solubility at 26°C: in water 0.26%; in alcohol 5.93% 



It is the chief constituent of the majority of samples of basic 

 fuchsin submitted for certification as biological stains. It is 

 sometimes furnished as the chloride, sometimes as the acetate, 

 generally the latter. 



n3 Rosanilin (Magenta I) 



This compound is mono-methyl fuchsin, or triamino-tolyl- 

 diphenyl-methane chloride. 



C20H20N3CI; Mol. Wt. 337.841 



{A basic dye; absorption maximum about 550) 

 Solubility at 26°: in water 0.39%ci; in alcohol 8.16% 



It is not a textile dye, and is not found free from pararosanilin 

 unless specially prepared. 



n4 Magenta II 



This theoretical constituent of basic fuchsin is never encountered 

 pure except as specially prepared in the laboratory, but probably 

 is present in market samples of the dye. It is di-methyl fuchsin, 

 or triamino-ditolyl-phenyl-methane chloride. 



