SECTION ONE 



(i) FaLg = MONOFALGIC ACID 



Formed when the acid fuclisin molecule accepts one molecule of 

 light green. 



NH2 

 -O3S- 



,/- 



^ 



iMaOsS— I 



\ 



> 



\ 



J NaOaS— I J—CH3 



Y Y 



HN+ NH2 



I o 



\/ 

 SO2 



O 



H5C2— N 

 H2C 



+N— C2H5 



I 

 CH2 



SOsNa SOsNa 

 Synonyms: MG purple, Falg purple 



(C57H47N50i4S5Na4) 



Michrome No. 820. Molecular weight 1278-304. A purple, acid 

 dye, pH ^•^^^. Solubility at 15° C: water all proportions, absolute 

 alcohol nil. 



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



79 



