SECTION ONE 



MAGENTA, BASICf 



Michrome No. 623. Molecular weight 338. A basic triphenyl- 

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



H2N 



NH2 



=NH2 



+ 



ci- 



MALACHITE GREEN 



Michrome No. 315. Molecular weight 365. A basic triphenyl- 

 methane dye, pH 2-^'^-. Solubility at 15° C: water 10%, absolute 

 alcohol 8*5%. 



(H3C)2N 



(H3C)2N 



+ 



ci- 



METHYL GREEN OO 



Michrome No. i"]"].X Molecular weight 458. A basic triphenyl- 

 methane dye, pH ^-6*. Solubility at 15° C; water 8%, absolute 

 alcohol 3 % . 



(H3C)3N 



N(CH3)2 



=N(CH3)2 



++ 



2C1- 



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

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

 t Note: In a previous work (Gurr, 1958a) this number was given in error 

 as 77. 



69 



