These Regulations, made under the Food and Drugs Act, exempt, except as provided in these Regulations, from the provision of paragraph (a) of section 3 of the Act, food named in Part I or Part II of the Schedule to these Regulations, which contains in or upon it: (a) any or all of the poisonous or harmful substances listed in amounts not exceeding the quantities stated therein in parts per million for that food; and (b) no other poisonous or harmful substance. Section 3 of the Act prohibits the