SECTION ONE 



ERIE GARNET 



Michrome No. 90. Molecular weight 698. An acid dis-azo dye, 

 pH g-^*. Solubility at 15° C: water 5%, absolute alcohol o-i%. 



NH2 OH 



N=N 



— N=N 



SOsNa 



SOaNa 



JANUS GREEN B 



Michrome No. 183. Molecular weight 483. A basic mono-azo 

 dye, pH 6-75*. (Note — This dye also contains the azine group.) 

 Solubility at 15° C; water 5%, absolute alcohol 1%. 



N(CH3)2 



ci- 



LIGNIN PINK 



Michrome No. 35. Molecular weight 509. An acid mono-azo 

 dye, pH g-i'^. Solubility at 15° C: water 12%, absolute alcohol nil. 



OH NH-COCH3 



NaOaS 



SOgNa 

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



49 



