20 ; oe 
cucumbers, and similar products are plunged for eight or ten minutesin 
a solution of copper sulphate in order to fix the natural green coloring 
matter. After removing the vegetables from the copper sulphate solution 
they are washed in pure water, placed in jars containing a solution of 
common salt, sealed and sterilized by heat. ~ 
The analyses of such vegetables show that they contain copper in con- 
siderable quantity, as will be seen by consulting the table below: 
Table showing copper vn 1 kilogram of re-greened canned vegetables, 

. Amouut of 
Vegetables. Authority. copper. 
Milligrams. 
IP ORS) ge cea teenie Galippe-ses-se=as 48 to 60 
Wo 7s. Fike ser @arles\< 22 acess 70 to 210 
DOU son see heme Gautier Seer oe aS 11 to 125 
3@aNS 2c =2 7-5 bon 2 aa | Soe cee eae ee ee 49 to 99 
Cucumbers ....... Magnier’.--......- 2 
Toniatoes-:-:....- Sestinives so-so 50 to 354 
It appears from the foregoing that vegetables re-greened by the cop- 
per process may contain from two to sixty times as much of the metal 
as Sprayed grapes. In other werds, if 1,000,000 pounds of sprayed 
grapes contain 5 pounds of copper, 1,000,000 pounds of re-greened vege- 
tables would contain from 38 to 150 pounds of the metal. Great Britain 
imported over 14,000,000 pounds of canned vegetables from France in 
1890, and it is safe to say that these vegetables contained more than 
twenty times as much copper as all the sprayed fruit in the United 
States combined. 
) 
