46 



COAL-TAR COLORS USED IN FOOD PRODUCTS. 



The final recommendations of Schacherl amount to permitting 



1. All the Azo colors, Nos. 7 to 393 of the Green Tables, except No. 86. 



2. All the Triphenylmethane colors, Nos. 427 to 492 of the Green Tables, except 

 the hydroxyl derivatives, which would be Green Tables Nos. 483, 484, 485, 486, and 491. 



3. All Pyronins, Nos. 493 to 527 of the Green Tables. 



4. All Oxyketones, Nos. 537 to 570 of the Green Tables. 



5. All Indulins, Nos. 599, 601, and 603 of the Green Tables. 



6. Naphthol Yellow S, G. T. No. 4. 



7. Methylene Blue, G. T. No. 650. 



The use of all other coal-tar colors would best be forbidden, partly from hygienic 

 and partly from practical considerations (rendering control more easy), until the 

 absolute harmlessness of the group in question is determined by physiological test. 

 * * * It should be required of all permitted coloring matters that they shall not 

 contain substances which are harmful to health, or even suspicious, either in chemical 

 union or as contaminations. (Fifth International Congress of Applied Chemistry, Ber- 

 lin, 1903, Vol. IV, pp. 1041-1048.) 



The exclusions recommended are all nitro-colors, except Naphthol 

 Yellow S; all acridin colors and all chinolin colors; Auramin, In- 

 dophenol and all nitro-colors, except Naphthol Yellow S, Schacherl 

 regards as not necessary; further, he has no knowledge of the physio- 

 logical action of any of the azoxy or the thiobenzenyl colors, and 

 aside from Methylene Blue, he has no knowledge of the physiological 

 action of the oxazins and thiazins. 



CLASSIFICATION OF RECOMMENDATIONS IN THE LITERATURE. 

 The following table shows the groups of coal-tar colors of the 

 Green Table classification and the Green Table numbers of the 

 members of each of the groups, together with the favorable or unfa- 

 vorable recommendations found in the literature in regard to each 

 and a statement as to those regarding which no recommendations 

 are made: 



Tabulation of recommendations found in the literature. 



