1. Water spraying method. If you want to keep the bought vegetables from turning yellow for a long time, you can first remove the withered and rotten leaves from the bought vegetables, then lay them flat on the ground, spray some water evenly on them with a watering can, and then prepare a plastic bag after spraying them all, put them in, and then put them in room temperature or refrigerator. In this way, after opening, the water will be on the surface of the leaves, and the leaves will become green, and there is no yellowing phenomenon.

2. immersion method. If you want to keep the green vegetables from turning yellow, you can actually do so. Prepare a clean plastic bag first, then grab the vegetables together, with the bottom facing down, and put them in the plastic bag. Next, leave a hole in the plastic bag, and add a proper amount of water into it, so that the water doesn't pass through the vegetable root. Then tie the plastic bag tightly, poke holes in the bottom with a toothpick, and drain all the water inside, so that it can be put into the refrigerator for refrigeration. The main principle is that in the process of water flow, vegetables absorb water, and when the water is lost, they take away the air in the plastic bag, so that its roots will not be oxidized and the leaves will not turn yellow.