10 kinds of tea can not drink Deterioration Is there no shelf life for tea? the answer is negative. Tea is essentially an agricultural product and has a shelf life. Tea is not easy to keep, easy to absorb moisture and mildew, deterioration of the tea contains a lot of harmful substances and bacteria, is absolutely not drinking. If the tea is left too long after being soaked, the tea soup will deteriorate due to oxidation and microbial reproduction. Such tea cannot be used again. Tea shelf life Green tea - unfermented, shelf life up to 1 year In general, the shelf life at room temperature is about 1 year. If it is not properly preserved, it may begin to yellow after 8 or 9 months, and it may become a little bitter. If you have a refrigerator that stores green tea, the shelf life can be extended to about 18 months. Black tea - fully fermented tea, shelf life of more than 2 years Can save for more than 2 years. In general, it is well preserved, and there are also phenomena of deterioration after 2 years or more. Therefore, try not to wait for drinking after 2 years. This will also affect the taste. Oolong tea - semi-fermented tea, 2 or 18 months The fragrance Tieguanyin, Taiwan's Wenshan bag seed, these have not been baked or the degree of baking is very slight, the shelf life is not as long as imagined, generally stored in the refrigerator, then it will be about 18 months. The baked ones, like the Wuyi Rock Tea, are still able to drink for 2 years. White Tea - 1 year tea, 3 years medicine, 7 years treasure White tea has more and more fragrant characteristics. The longer the storage year, the higher the value and taste. Black tea - loose tea for 3-5 years, pressing for 10-15 years of tea In a clean, moisture-proof and odor-free environment, it can be stored for a long time. In general, loose tea is 3-5 years old, and the taste has reached the best level. Pressing tea for 10-15 years is almost the same. Yellow Tea - shelf life of 1 year The production process is more yellow than green tea, its shelf life is about 1 year, and there is no growth due to stuffy yellow. Pu'er Tea - 15 Years of Cooked Tea Cooked tea, generally more than 15 years; raw tea, preserved more properly and more fragrant, more and more valuable. The first tea In the process of planting, processing, and packaging, modern tea is inevitably contaminated by pesticides, fertilizers, dust, and other substances. According to Chen Zongxi, an academician of the Chinese Academy of Engineering and a doctoral advisor of the Tea Research Institute of the Chinese Academy of Agricultural Sciences, 80% of the quality and safety issues of Chinese tea are on pesticide residues. The pesticide residues in tea may not only cause chronic toxicity, but also cause acute poisoning, especially to children. The first tea is tea water. It should be poured out as soon as possible and then poured into boiled water to wash away the impurities and pollutants. This is the most healthy tea. Burnt Tea The tea that has been overcooked has lost its nutrition and its taste is not good. Long tea The brewing time is too long, the tea polyphenols, lipids, aromatic substances, etc. are automatically oxidized, not only the tea soup is dark, bad taste, low in flavor, loses the taste value, but also because of the vitamin C, vitamin P, amino acids in the tea, etc. Reduced by oxidation, so that the nutritional value of tea soup greatly reduced; At the same time, due to the shelving of the tea soup for too long and being contaminated by the surrounding environment, there is a large number of microorganisms (bacteria and direct bacteria) in the tea soup, which is unsanitary. Overnight tea Tea contains a lot of protein, most of them are insoluble in hot water, and remain in the leaves. When the water temperature is high, the protein on the tea will rot. After leaving for a night, there will be a strain of bacteria and tea residue. A lot of tannic acid turns into a powerful irritating oxide, which stimulates the stomach and causes inflammation. Cold tea Tea should be hot and drink, warm tea, hot tea can make people ear clear eyes; cold tea on the body there are cold, polythene side effects. Hot tea Tea is usually brewed with high-temperature water, but it cannot be consumed when the water temperature is too hot. Too hot teas have strong irritations in the throat, esophagus, and stomach. If you drink too hot tea for a long time, you may cause damage to these organs. According to foreign studies, people who regularly drink tea whose temperature exceeds 62°C are more vulnerable to stomach damage and are prone to gastropathy. The temperature of tea should be below 56°C. Skewered tea After a period of time, tea and other tasteful things have changed their taste. Some taste is toxins, such as paint, camphor and so on. Strong tea Strong tea contains a lot of caffeine, theophylline, etc., strong stimulation, drinking tea can lead to insomnia, headache, tinnitus, vertigo, not good for the stomach and stomach, some people will have a sense of vomiting after drinking. Raw tea The so-called raw tea refers to dried green tea that has been directly dried without being rubbed. The tea is green and green in shape, and contains almost the same compounds as the fresh leaves. The low-boiling alditol compounds have little conversion and volatilization, and the aroma has serious green gas. The elderly drink this kind of green tea, and it is very irritating to the gastric mucosa. After drinking, it is easy to produce stomachache; young people will also feel stomach discomfort after drinking, which is commonly referred to as “squeezing the stomachâ€. Mistakes to buy this kind of raw tea, it is best not to directly drink, can be placed in a non-greasy iron pot, slow fire slowly with a slow fire, roast green gas, to be produced after the mild chestnut after drinking. Three Misunderstandings for Drinking Tea Tea leaves a day Tea must be separated from tea and water. Even if there is no professional tea set, you can prepare a teapot or teacup with a strainer. A large teacup and a tea leaf are the most undesired ones on a day, so that they cannot taste the true taste of tea, and long-term soaking can easily precipitate heavy metals in the tea, which is unhealthy. New tea is not washed, leftover tea is not thrown, tea scale is not clear Regardless of whether it is a young new tea or a precious Chen tea, there may be dust stains on the surface. It is best to “wash†it, and not to drink the first tea. Some people are reluctant to wash away the tea stain on the teapot. They think that it can raise pots. In fact, tea scale is not only bad for health but also affects the taste of tea. Tea contains caffeine that affects sleep Many highly fermented teas, such as black tea and ripe pu-erh, have very little caffeine left, which will not only affect sleep. On the contrary, drinking tea that helps digestion for one hour after dinner can clear the stomach and help sleep. Most healthy tea making method In the Ming Dynasty, Zhang Dafu wrote "Plum Blossom Cottage Talk:" "Tea must be made in water, 80% of the tea, in case of water, the tea is also very embarrassing; 80% of the water, try ten tea, tea only eight ears." Visible, tea water is very important. What kind of water is best for making tea? - It is better to make tea with mountain springs, natural mineral water is better! Using tap water from rivers and shallow wells in the surface, tap water that has been sterilized by purification and chlorination is not suitable for tea because it contains chloride ions and bleaching powder. Mountain springs, mostly from subterranean rock formations, are naturally clear and clean by natural filtration of rocks and gravel. Contemporary scientific experiments have also proved that it is better to use spring water to make tea. Light mineral water - made of natural mineral water as source water, not only for soft water, especially for boiling water, especially for tea, tea tea soup clear, fresh taste, easy to send tea, and contains good for the body Trace elements can provide the nutrients needed by the body. This article is comprehensive: South Review, Women's Health Network, Tea Culture, etc.
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