115 



Phenyl Methane Dyes 



AURAMINE O 



139 



C. I. NO. 655 



Synonyms: Canary yellow. Pyoktaninum aureum. 



Pyoktanin yellow. 



CHj 



\N_/ 



CH, 



_C_ 

 NH2 



./-\_N/ 



CH: 



CH3 



CI/ 

 C17H22N3CI; Mol. Wt. 303.827 



{A basic dye; absorption maxima [380], J^31-JtSJt) 



Solubility at 26°C: in water 0.74%; in alcohol 4.^9% 



.8- 



.7- 



I I I I I I I I I I I I 

 360 390 420 450 

 WAVELENGTH m^ 



Fig. 17. Spectral curve of auramine O. 



I J 



480 



