STAINING, PRACTICAL AND THEORETICAL 



NAPHTHOCHROME GREEN 



Michrome No. 938. Molecular weight 506. An acid hydroxy- 

 triarylmethane {hydroxy-dinaphthylphenylmethaiie) dye, pH yj*. 

 Solubility at 15° C; water 3%, absolute alcohol 1-5%. 



This dye might possess hydrogen ion indicator properties. If 

 used at a suitable pH it might also impart polychrome pictures 

 to tissues in much the same way as solochrome cyanin R. 



HO 



NaOOC 



COONa 



NEW FUCHSINt 



Michrome No. 624. Molecular weight 366. A basic triphenyl- 

 methane dye. Solubility at 15° C; water 1%, absolute alcohol 10%. 



CHc 



— NH2 



NH2 



CHc 



+ 



ci- 



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



t Note: This is one of the component dyes of basic fuchsin. 



70 



