Can you still drink lemon slices that have turned black should be asked whether blackened lemon slices in water can be drunk, this issue cannot be generalized, but should be judged by the cause of lemon slices turning black. Lemon is rich in vitamin C, which is a strong reducing agent. After fresh lemon slices are placed in the air for a short period of time, the vitamin C inside comes into contact with the air and oxidation reaction occurs, thus making the lemon slices slightly blackened. In addition dried lemon slices, in the process of processing, can also cause vitamin C to oxidize and turn black. Lemon slices that have turned black due to the above reasons can be consumed after making water. If the lemon slices have been placed for a long time and contaminated by airborne bacteria, mold and other microorganisms, the invading microorganisms grow and multiply on the lemon slices, resulting in the blackening of the lemon slices, the lemon slices in this case are not drinkable. After drinking, it will easily lead to bacterial infection and poisoning, so you need to avoid it as much as possible. It is recommended to choose fresh lemons to drink and to pay attention to whether the lemon slices are spoiled before making water. If you have abdominal pain, diarrhea and other adverse reactions to drinking spoiled lemon water, you should seek medical attention promptly to avoid serious consequences.