CHEESE 109 
Poisonous Metals—Lead chromate has been 
found in the rind of cheese, and finely divided 
lead in a number of Canadian cheeses. In 
England zinc sulfate has been employed under 
the name of cheese spice to prevent the heading 
and cracking. Arsenic has also been found; it 
may be detected by Reinsch’s test. Lead, zinc, 
and chromium may be detected by ashing a 
portion of the sample in a porcelain crucible and 
applying the usual tests. 
