Why do Gala (a type of apple) apples turn brown?
All apples, in fact most cut fruit, will turn brown once exposed to air. To prevent this, you can dip the fruit in lemon juice or other citrus juice. You can also sprinkle on some FruitFresh, which is a commerical product containing citric acid. It is made for this purpose and can usually be found with the canning supplies in your grocery store. Hope this helps.
Besides assorted fruits, potatoes also do the same thing once cut. Here are a couple of short scientific articles that will help explain why (and how to prevent) in more detail:
I cut the apples and place them in salted water to keep from turning brown until I am ready to bake with them. I also found the tip to soak them in pineapple juice to keep their color especially when you want to use them on a fruit tray with a dip.
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