How to Use Citric Acid to Keep Fruit From Browning

Certain fruits, such as apples and bananas, brown quickly after being sliced. This makes the fruit visually unappealing when added to fruit salads, or frozen, canned or dehydrated. One way to prevent browning is to treat the cut fruit with a bath of citric acid. Citrus fruits, such as oranges and lemons, contain citric acid, which is why they don't require such treatment, and why their juice is often used to prevent the browning of other fruit.