what are preservatives
The most common preservatives, such as sorbic acid, benzoic acid, calcium propionate, sodium nitrite and disodium EDTA, are used to kill bacteria and fungus that cause rot. Other preservatives, such as BHT, BHA and propyl gallate, prevent food from changing color when exposed to oxygen.reservatives and additives are listed, however, on the ingredients list of any packaged food. While some packages will specify which ingredients are preservatives, others will simply state the name of the chemical.