112 



Nothing. 



COAL-TAB COLORS USED IN FOOD PRODUCTS. 



FAVORABLE. 

 UNFAVORABLE. 



1. CHLOPIN (p. ISO}: On his own experiments classes it as suspicious. The experi- 

 mental data are as follows: 



Experimental data by Chlopin. 

 [1 gram=125 mg=87.5 grains.] 



DOUBTFUL. 



1. Winogradow (Zts. Nahr. Genussm. 1903, v. 6, p. 589} says it almost completely 

 inhibits digestion. 



G. T. 287. 



Trade name. Azo Blue. 



Name under which it was offered on the United States market as a food 

 color in 1907. Azo Blue. 



Scientific name. Sodium salt of ditolyl-disazo-bi-alpha-naphthol- 

 para-sulphonic acid. 



Discovered. 1 885. 



Shade. Grayish violet. Offered by 1 out of 12 sources. 



FAVORABLE. 



1. Permitted by Confectioners' List. 



2. WEYL (p. 134} ' The following is a summary of the results obtained with the Disazo 



colors submitted to test by me, viz : * * * Azo-blue, * * * ." "All 

 these proved to be nonpoisonous." 



3. "Azo-blue ib harmless, both when administered by the stomach and subcuta- 



neously." A. A dog received 237 milligrams per kilogram body weight, or 166 

 grains per 100 pounds; 2 days later this same dose was repeated, and the urine 

 was a violet color strongly alkaline and contained a little albumen. The next 

 day the dose was increased to 2.5 times; colorless urine, and little albumen; 

 there was no phenol. The next day 4 time* the original dose was administered; 

 abundant bluish-violet urine and little albumen. No administration for 4 

 days, when 2.5 times the original dose were given, and that dose repeated 3 days 

 later; during this time the urine was colorless and contained little albumen; 

 there was a very slight increase in weight. B. A dog received 319 milligrams 

 per kilogram body weight, or 233 grains per 100 pounds daily for one month; 

 animal remained well with good appetite; a slight amount of albumen made 

 its appearance in the urine, (p. 144.} 



