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This product is actually a combination of malic and citric acids, organic compounds found in various fruits like blueberries, apricots, cherries, peaches, apples, grapes, and more. It is a food additive.
Tart and Sour is a e-liquid additive that is used in combination with fruity flavors to enhance the taste.
Add a few drops for a tangy result. Add a bit more to create a sour flavor.