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This question already has an answer here:

Apple pieces became black very quickly. How can I save them?

marked as duplicate by rumtscho Nov 15 '18 at 10:39

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Apples turn brown due to contact with air and there are a couple of things (that I know) to slow down the process.

  1. Toss the apples with a little bit of lemon (or lime) juice
  2. Submerge them in ice water

both will retard the brown (oxidation) on apples and a lot of other fruit too.

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