Sliced apples and pears make a healthy snack. But, after a few hours, the slices turn brown, which make them less appetizing. The problem can be easily remedied by applying a mild acidic solution to the apples using natural ingredients, such as citrus juice. Citrus juice contains antioxidants, which slows the oxidation process that turns the fruit brown. You can even use lemon-lime soda or honey, which both contain enough antioxidants to prevent the browning.
Prepare a mild acidic solution. Many people simply squeeze a lemon, orange or grapefruit into a bowl of cold water. You also can add pineapple juice or cider vinegar to the water, depending on your flavour preference. Use about 1/4 cup of juice per quart of water. Another option is to fill the bowl with lemon-lime flavoured soda or apple juice. Both of these have enough acidity to stop the browning process.
Soak the apple or pear slices in the solution for a couple of minutes.
Remove the fruit slices and pat them dry with a towel.
Seal the slices in cling film if you want them to last even longer. The less air that comes into contact with the slices, the longer they will keep their original colour.
The type of juice you use will affect the flavour of the fruit. If you do not want a citrus flavour in your fruit, you can coat the slices apples with syrup, honey or wine, depending on how you plan to use the slices. These ingredients also contain antioxidants that will slow the browning process.