Reader Mr. Jing asked: My friend came to my house from Shandong and brought a box of peaches with pink skin, which was very beautiful. I washed a dish that night. Because peaches have hair on them, and my daughter hates peach hair very much. In the past, my family used to wash peaches with salt, but my wife's blood pressure was high, so I washed them with baking soda, which is usually used to make pasta. Although the hair of the peach was washed clean, the peach turned purple. Is this caused by pesticides in peaches? I later washed one with salt, but it didn't change color, and it was still pink. Help you ask: nutritionist Xin Huang said that this discoloration is normal. Peaches are pink because they contain anthocyanins, a natural pigment. Anthocyanins are red when acidic, usually blue when alkaline, and there may be transition colors such as purple and green in the middle. Can be eaten normally. Washing peach hair with alkali is more scientific than washing with salt water. Peach peel is rich in pectin, which is easy to decompose under alkaline conditions, making the cell wall soft, making the peach peel easier to peel off and more convenient to eat. However, the soaking time in alkaline water should not be too long, otherwise the alkaline water entering the peach will destroy VC, affect the taste of the pulp, and also cause the fruit to change color, yellow or brown.