582 



and -|- 3,9 but about -|- 7,6 and -|- 5,4. The intensity of 

 colouring too was herewith in agreement. 



The colour of N". 6 and 7 (I") after 24 hours was near! 

 to that of N°. 4 (I"). 



yellow- 

 y equal 





to 



cr 



o 



't 

 » 



o 



> 

 03 



r 

 m 



03 



