TABLE 8 



Composition of "standard colors" prepared with brom-cresol-purple 0.02 per cent 

 watery solution — range pH 5.4 to pH 6.6 



* According to phthalate and phosphate NaOH mixtures, pairs 3, 4, 5, 6, 7, 

 should read: pH 5.9; 6.1; 6.3; 6.5; 6.7. 



TABLE 9" 



Composition of "standard colors" prepared ivith cresol-red 0.02 per cent watery 

 solution — range pH 7.4 to pH 8.6 



0.1 PER 



CENT 



HC1 



10 

 10 

 10 

 10 

 10 

 10 

 10 



INDI- 

 CATOR 



0.7 

 0.6 

 0.5 

 0.4 

 0.3 

 0.2 

 0.1 



Yellow 



Lighter yellow 

 Pink yellow 

 Yellow pink 

 Pink 



Beginning red 

 Red 



pH 



7.4 

 7.6 

 7.S 

 8.0 

 8.2 

 8.4 

 8.6 



* For the composition of "standard colors" prepared with brom-thymol-blue 

 and phenol-red see table 3 and table 4. 



TABLE 10 



Com position of "standard colors" prepared with thymol-blue-alkaline-range 0. 

 per cent water solution— range pH 8.2 to 9.4 



458 



