140 



COAL- TAB COLORS USED IN FOOD PRODUCTS. 



Experimental data by Chlopin Continued. 

 [1 gram=114 mg=80 grains.] 



DOUBTFUL. 



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

 inhibits digestion. 



G. T. 620. 



Trade names. Gallocyanin DH and BS; Fast violet; Gallocyanin 

 RS, BS, and D. 



Scientific name. Dimethylamido dioxy phenazoxoniumcarboxy- 

 late. (BS is the bisulphite compound.) 



Discovered and patented. 1881. 



STiade. Bluish Violet. Not offered. 



Nothing. 



FAVORABLE. 



UNFAVORABLE. 



1. SANTORI (MoleschotCs Untersuchunfjen, 1895, v. 15, p. 51): A dog weighing 5,400 

 grams received 7.5 grams dye in 30 days, which amounts to 46 milligrams per 

 kilo per day or 32 grains per 100 pounds per day. Throughout all the time 

 the animal remained well, had good appetite, temperature normal, no loss of 

 weight; urine and feces colored deep blue black. Killed by chloroform. 

 Autopsy showed incipient fatty degeneration of the liver and a swelling of the 

 kidneys. Conclusion: Poisonous. 



G. T. 639. 



Trade names. Meldola's Blue; Cotton Blue R; Fast Navy Blue 

 R; Naphthol Blue R and D; Naphthylene Blue R in crystals; Fast 

 Blue R, 2 R and 3 R for cotton in crystals; Fast Navy Blue RM 

 and MM. 



Scientific name. Zinc double chlorid of dimethylarnido-naphtho- 

 phenoxazonium chlorid. 



Discovered. 1879. 



STiade. Dark Violet. Not offered. 



Nothing. 



FAVORABLE. 



UNFAVORABLE. 



1. CHLOPIN (pp. 194-195) on his own experiments reports this color as "very poison- 

 ous." The experimental data are as follows: 



