42 Kansas Academy of Science. 



applied subsequently to both the natural color and the added arti- 

 ficial color. 



If natural colors and artificial colors are mixed, the added color 

 will completely mask the natural color reactions. Since the arti- 

 ficial colors give an entirely different set of reactions upon oxida- 

 tion and reduction, the presence of the added color can be readily 

 detected. 



