740 FOODS AND FOOD ADULTERANTS. 



ANALYSES BY H. A. WEBER. 



Twenty-one of the samples contained glucose. It is assumed that all 

 samples containing dextrin were mixed with glucose. Twenty-one sam- 

 ples contained coloring matter, in every case of an organic nature. The 

 particular color was determined in each case, making the observations 

 of Mr. Weber on this point of great value. 



Seventeen of the samples contained starch, but only three any nota 

 ble quantities, viz: Hos. 11, 16, and 21. Soluble starch was found in 

 samples Nos. 5, 8, 11, and 20. 



SUMMARY. 



Sample*. 



Glucose 21 



Insoluble starch, etc , 3 



Soluble starch 4 



Coloring matters 21 



Of which 



Cochineal 5 



Corallin 8 



Eosin 6 



Bengal red 5 



ANALYSES BY F. G. WIECHMAN. 



Of the 25 samples examined, 14, or 56 per cent, contain starch or 

 glucose (starch sirup). 



Eleven samples contain more than 0.25 per cent of matter insoluble 

 in water; this ranges in amount from 0.29 to 2.88 per cent, and with 

 but few exceptions consisted of starch. 



The coloring matters were in all cases destroyed by ignition, and 

 were with but two or three exceptions wholly soluble in water, which 

 would class them as of vegetable or animal origin or as coal-tar colors. 



NOTES BY MH. WIECHMANN. Nos. 154, 162, and 166 contain a fluorescent coloring 

 matter pink and yellowish green probably eosin. 



Nos. 158 and 161 were tested for copper and iron, but with negative result. 



No. 165 was examined for lead, also with a negative result. 



The red coloring matter in No. 70 is partially insoluble in water and in alcohol. It 

 turns purple with caustic potash and pink with acetic and with hydrochloric acids, 

 and is most probably a lake of some vegetable color or cochineal. 



The violet coloring matter in No. 159 is insoluble in water. Tests made prove that 

 it is not indigo, Prussian blue, Antwerp blue, smalt, or ultramarine. It is either 

 cyaniii, the natural coloring matter of the violet, or else a coal-tar product. 



