The reason why tea turns black

Tea will turn black if left for a long time, mainly due to oxidation. Also, because tea contains tea polyphenols, which will cause the color of the tea to darken over time, so it is recommended that you brew and drink tea immediately, as this will have a higher nutritional value. If tea is left for a long time, bacteria may grow and the tea will deteriorate. Drinking it at this time will affect the health of your stomach and intestines.

The reason why tea turns black

There are many reasons why tea turns black. The different tea leaves and the environment also have a certain impact. The most important change is the further oxidation of tea polyphenols in the tea, which deepens the color. A cup of clear green tea, especially if left for a long time in high temperatures, will lose its green color and become more yellow. This is the oxidation of tea polyphenols in tea to form yellow-red and reddish-brown oxidation products, mainly theaflavins, thearubigins, theabrownins, etc.

The skin care effect of tea

1. Reduce dark circles

Although the color of tea is not white at all, it can help us reduce dark circles. For panda eyes caused by staying up late, mix coix seed and green tea and apply it on the lower eyelid with the help of heat to eliminate dark circles and edema.

2. Shrink pores

Use the leftover green tea (it can be left overnight if it is at a low temperature) as cleansing water. Soak a cotton pad in it and wipe the skin. The catechins in the tea can shrink pores and increase skin elasticity.

3. Astringent and whitening

Don’t think that the black color of tea represents melanin. In fact, tea does have a certain whitening effect. Adding a little angelica powder to green tea and applying it on your face can tighten pores and whiten your skin.

After reading this article, I believe you will all clearly understand why tea turns black after being left for a long time. In fact, tea can not only regulate women's gastrointestinal tract, but can also be applied directly on the skin, which also has a certain auxiliary effect on improving the skin. Therefore, female friends who love beauty can try different teas!