Sodium chloride (salt) from acetic acid, a natural acid. Acetic acid is found in all kinds of fruit and in high concentrations in all fermented products. Sodium acetate is the substance provides the taste to salt and vinegar chips. It can also be added to food products as a preservative; it is than usually called sodium diacetate or E262.

The maximum permitted use of this product in various foodstuffs can be found on the website of the European Commission: Food additives Database.