Fumaric Acid or E297 is an organic acid (dicarboxylic acid) naturally found in all kinds of fruits and vegetables which is commonly used as an acidity regulator and flavoring agent.
Sodium Sulfite or E221 is a white powder (inorganic, non-stable) typically used as a synthetic preservative to avoid food spoilage and has a faint Sulfur Dioxide smell.
Biphenyl or E230 is an organic compound used classically to battle mold and fungus on citrus fruits but can have other applications as far as the preservation of food goes.
Potassium Bisulfite or E228 is a white solid said not to be a real compound (synthetic) used to prevent unwanted spoilage and extend shelf life.
Calcium Bisulfite or E227 is an inorganic compound (synthetic preservative) used in both the wood pulp industry and the creation of certain processed foods and beverages.
Calcium Sulfite or E226 is an inorganic compound (synthetic preservative) that has the appearance of a white crystalline powder. It is used in food for the purposes of extending shelf life and preservation (it has anti-bacterial and anti-fungi properties).
Potassium Metabisulfite or E224 is an inorganic compound (synthetic preservative) that comes in a form of white crystalline powder and is used for the purpose of battling bacteria and fungi in food, supplements, and medicine.
Sodium Metabisulfite or E223 is an inorganic compound used in food to extend the shelf life of predominantly dried foods.
Sodium Bisulfite or E222 is a crystalline powder (or comes in the form of white crystals) with a slight sulfurous smell used for food preservation (especially, taste) due to its antimicrobial and antioxidant properties.
Potassium Sulfite (E225) is a white solid inorganic compound (synthetic preservative) used in food to prevent spoilage from bacteria and fungi.
Propyl-P-Hydroxybenzoate Sodium Salt or E217 is the sodium salt sibling of the Propyl-P-Hydroxybenzoate (E216) which is a synthetic ethyl ester belonging to parabens.
Propyl-P-Hydroxybenzoate or E216 is an artificial ethyl ester from the origins of Benzoic Acid to help fight off yeast, fungi, and mold typically found in skin products.