Is it normal for purple cabbage to lose color?

Everyone should be familiar with cabbage, but when it comes to purple cabbage, they may feel a little unfamiliar. In fact, purple cabbage is a kind of purple cabbage. It has bright colors and looks appetizing, and is loved by many children. However, some people find that the water has changed color when washing purple cabbage. They think that the purple cabbage has faded and are worried whether pigments have been added to the purple cabbage. So is it normal for purple cabbage to fade?

1. You can eat it. Purple cabbage turns blue after blanching due to the anthocyanins in it. This is a normal phenomenon and you can eat it with confidence. Purple cabbage is rich in anthocyanins, which appear red in acidic conditions and usually turn blue in alkaline conditions. There may also be transitional colors such as purple and green in between. The water in the north is generally weakly alkaline, so it is not surprising that purple cabbage turns blue after blanching. When we stir-fry purple cabbage, it changes color because the organic acid in it evaporates due to heating, and the acidity decreases, so it becomes "blue cabbage". If you want the color of the dish to look good, the method is actually very simple - just add vinegar, because anthocyanins are relatively stable under acidic conditions. Whether adding fruit vinegar or rice vinegar, the color of purple cabbage can be turned into a beautiful purple-red, even redder than its original color.

2. This is an anthocyanin. Discoloration during cooking and frying is a normal phenomenon and there is no need to worry.

3. The purple color of purple cabbage is an anthocyanin, which exists in purple cabbage itself. However, since anthocyanin is a relatively active element, it is normal for it to fade. As for the purple cabbage losing its blue color, it is related to the acidity and alkalinity of the water. It is a chemical reaction. If it is not cut, it will not fade. After soaking the uncut and washed cabbage in water for five minutes, the water did not change color. After the cabbage is cut and washed, the washing water turns blue. When the cabbage is cut and boiled, both the water and the cabbage turn blue. Although it is normal for cabbage to fade, you should try to minimize the discoloration when eating it.