How much vitamin C to use for soaking apples to prevent browning?

To prevent browning in Apples, you can use a solution of about 1 teaspoon of vitamin C powder (ascorbic acid) dissolved in 1 cup of water. Soak the Apple slices in this solution for about 5-10 minutes, then drain and rinse lightly if desired. Alternatively, you can use commercial vitamin C products or tablets, following the same ratio for effective results.