Toss cut apples with lemon juice or another acidic juice
Soak apple slices in cold water with a little salt for a few minutes, then rinse
Soak apple slices in cold water with a little honey
Use a commercial anti-browning fruit treatment
Keep cut apples submerged in water
Store cut apples in an airtight container
Refrigerate cut apples promptly
Cut apples with a clean, sharp knife
Slice apples just before serving
Choose firmer, fresher apples
Keep apple slices covered with plastic wrap or a tight lid
Blanch apple slices briefly, then cool them quickly
Use apple varieties that brown more slowly