Definitely with nothing on them. Lemon juice is used to preserve
To keep apples from turning brown add either powdered ascorbic acid or lemon juice and water. Cover the apples with plastic wrap placed directly on top of the apples.
Put them in water with some lemon juice
water
yes
Metal typically rusts faster in lemon juice compared to bottled water. Lemon juice is acidic, which can accelerate the corrosion process on metal surfaces. Bottled water, on the other hand, does not contain acids that would promote rusting.
For short term, dip in solution of lemon juice and water.
Nothing (for a time) as apples are waterproof.
If you put lemon juice in the water it will prevent the browning.
vinegar
nothing its boiled water that has nothing left over. It will most likely evaportate faster than regular water
Salt water can accelerate the dehydration process of apples due to osmosis, while lemon juice might help slow down dehydration by providing a protective layer of acidity that helps prevent browning. Both can potentially affect the rate of dehydration in different ways.
You can peel apples up to a day in advance if stored properly. To maintain freshness, place the peeled apples in a bowl of water with a bit of lemon juice to prevent browning. If you need to prepare them further in advance, consider freezing the peeled apples, which can last for several months.