SECTION ONE 



TRYPAN BLUE 



Michrojne No. i86. Molecular weight 961. An acid dis-azo 

 dye, pHg-i*. Solubility at 15° C; water i'0%, absolute alcohol 



0-02%. 



CH. 



N=N 

 NaOaS 



N=N 

 NaOaS 



CH. 



OH NH2 



SOaNa 



OH NH2 



SOsNa 



VICTORIA GREEN G 



Michrome No. 630. Molecular weight 849. An acid tris-azo dye, 

 pHg-i^"^'. Solubility at 15° C; water 1-85%, absolute alcohol 



1-85%. 



N=N 



COONa 



OH 



OH NH2 



N=N- 



— N=N 

 SOaNa 



NaOaS 

 * 1% in neutral distilled water; see pages 17 and 29. 



NH2 



53 



