As a sour agent categorized as a food additive, it is used mostly together with another sour agent called citric acid for refreshing beverages, fruit-flavored candies, jelly, ice cream, and the like. The monosodium salt produced by the reaction of fumaric acid for sale with sodium hydroxide is also used as a sour seasoning as well as an intermediate for synthetic resins and mordants. It is mainly used for the processing of food like meat and fish products. Fumaric acid can also be used as an acidity regulator, an acidifier, an antioxidant aid, a pickling accelerator, or a spice. It is a strong buffer maintaining the solution with a PH of about 3.0 and plays an important role in preventing bacteria and fungus. In the meantime, it is one of the strongest solid acids with an astringent taste and a low absorption rate,