194 COAL-TAB COLORS USED IN FOOD PRODUCTS. 



Light Green SF Yellowish: 0.02; 0.02; 0.05; 0.05. (Average, 0.035.) 



Erythrosine: 0.11. 



Indigo Disulpho Acid: 0.02; 0.02; 0.03. (Average, 0.03.) 



ACID ETHER EXTRACT. 



Naphthol Yellow S: 0.33; 0.44; 0.72; 0.77; 0.78; 0.94; 0.95; 0.97; 1.07; 1.16. (Aver- 

 age, 0.81.) 



Ponceau 3 R: 1.13. 



Orange I: 0.23; 0.25. (Average, 0.24.) 



Amaranth: 0.05; 0.05; 0.12; 0.15; 0.19; 0.27. (Average, 0.14.) 



Light Green SF Yellowish: 0.05; 0.05; 0.05; 0.05. (Average, 0.05.) 



Indigo Disulpho Acid: 0.04; 0.06; 6.15. (Average, 0.08.) 



TOTAL ETHER EXTRACT. 



Naphthol Yellow S: 0.43; 0.63; 0.86; 0.93; 0.94; 1.02; 1.10; 1.11; 1.43; 144. (Aver- 

 age, 0.99.) 



Ponceau 3E: 1.51. 



Orange I: 0.27; 0.92. (Average, 0.59.) 



Amaranth: 0.08; 0.26; 0.36; 0.38; 0.59; 0.61. (Average, 0.38.) 



Light Green SF Yellowish: 0.07; 0.07; 0.10; 0.10. (Average, 0.09.) 



Erythrosin: 0.11. 



Indigo Disulpho Acid: 0.06; 0.08; 0.18. (Average, 0.11.) 



Insoluble matter. The amount of insoluble matter (total, volatile, 

 and nonvolatile) is a measure of the cleanliness of the materials 

 used, as well as of the cleanliness of treatment during the manu- 

 facture of the coloring matter. The following tabulation shows the 

 variations in these three figures for each of the 26 specimens of the 

 7 permitted colors, examined, as in the preceding cases: 



Insoluble matter. 



VOLATILE INSOLUBLE. 



Naphthol Yellow S: 0.00; 0.00; 0.00; 0.02; 0.02; 0.05; 0.13; 0.86; 0.97; 1.46. (Aver- 

 age, 0.35.) 



Orange I: 0.39; 1.66. (Average, 1.03.) 

 Amaranth: 0.32; 0.51; 0.83; 1.10; 1.71; 1.93. (Average, 1.07.) 

 Light Green SF Yellowish: 0.16; 0.38; 0.22; 0.41. (Average, 0.29.) 

 Erythrosin: 0.50. 

 Indigo Disulpho Acid: 0.77; 1.23; 1.25. (Average, 1.08.) 



NONVOLATILE INSOLUBLE. 



Naphthol Yellow S: 0.00; 0.00; 0.00; 0.00; 0.00; 0.00; 0.03; 0.05; 0.10; 0.27. (Aver- 

 age, 0.05.) 



Orange I: 0.23; 0.25. (Average, 0.24.) 



Amaranth: 0.21; 0.54; 0.55; 1.39; 1.78; 1.98; (Average, 1.08.) 



Light Green SF Yellowish: 0.00; 0.06; 0.64;- 0.65. (Average, 0.34.) 



Erythrosin: 0.22. 



Indigo Disulpho Acid: 0.00; 0.59; 0.59. (Average, 0.36.) 



TOTAL INSOLUBLE. 



Naphthol Yellow S: 0.00; 0.00; 0.00; 0.05; 0.05; 0.12; 0.40; 0.86; 0.97; 1.51. (Aver- 

 age, 0.40.) 



Orange I: 0.62; 1.91. (Average, 1.27.) 



