144 



COAL-TAR COLORS USED IN FOOD PRODUCTS. 



Experimental data by Chlopin Continued. 



No. 2. 

 [1 gram 122 mg=85 grains.] 



DOUBTFUL. 



1. WINOGRADOW (Zts. Nohr. Genussm., 1903, r. 6, p, 589), says it noticeably retards 

 digestive action; is not indifferent. 



G. T. 654. 



Trade name. Toluidin Blue O. 



Scientific name. Zinc-double-chlorid of dimethyl-diamido-tolu- 

 phenazthonium-chlorid . 



Discovered and patented. 1888. 

 Shade. Blue. Not offered. 



Nothing. 



FAVORABLE. 



UNFAVORABLE. 



1. FRAENKEL (p. 574): "Toluidin Blue * * * is a strong poison for micro- 

 organisms, and may be used in eye treatment, like Methylene Blue." 



G. T. 659. 





Trade names. Primulin; Thiochromogen; Sulphin; Poly chromin ; 

 Aureolin. 



Scientific name. Sodium salt of the mono-sulphonic acids of the 

 dehydrothionated condensation products of dehydrothiotoluidin 

 (mixed with some sodium dehydrothiotoluidin-sulphonate). 



Discovered. 1 887 . 



Shade. Yellow. Not offered. 



Nothing. 



FAVORABLE. 



UNFAVORABLE. 



1. CHLOPIN (p. 203} examined this color, and on his own experiments reports it aa 

 "suspicious." The experimental data are as follows: 



