... function. It can be used as acidulant, acidity regulator, acidifier, th Trans-Butenedioic Acid(Fumaric Acid)Specification: trans-butenedioic ... . It can be used as acidulant, acidity regulator, acidifier.Properties:White odorless powder or, with speical sourness that ... function. It can be used as acidulant, acidity regulator, acidifier, thermal-oxidative resist auxiliary, curing accelerant and spice. ...