The nutritional value of black tea is rich in carotene, vitamin A, calcium, phosphorus, magnesium, potassium, caffeine, isoleucine, leucine, lysine, glutamic acid, alanine, aspartic acid and other kinds of nutrients. Black tea during fermentation chemical reaction of polyphenols in the chemical composition of fresh leaves make larger changes, will produce theaflavin, thearubigins other ingredients, significantly increased its aroma than fresh leaves, forming a unique black color, aroma and taste. Buy high-grade black tea tea buds content is high, thin strip tight (lobular kind) or fat compaction (big leaves), the color black has shiny, golden hairs on the tea bar more; rich aroma of sweet, sweet taste of alcohol Xianshuang, soup Hongyan, bowls and tea touching the wall at the golden circle of the iris, commonly known as the "Golden Circle." Chaya midrange content of less slightly glossy black color, slightly golden hairs; slightly sweet aroma, taste sweet and a little pale, soup is still bright red, gold ring owe Huang Liang. Low Chaya less mature leaf spread main strip loose and light, color zeu slightly dry, lack luster, no gold cents; with coarse aroma, taste bland. Storage of high-grade tea is tea factory sealed packaging, drinking soon after opening. Unopened packaging presses the conditions described can be saved. Black tea consumption 1. Generally speaking, drinking tea in front, Regardless of drinking laws, had to be ready for tea, for example a water pot, poured a cup of tea or cup and so on. At the same time, the need to use clean water, clean them one by one, in order to avoid contamination. 2. In general, the combination of need, put only 3-5 grams per cup of tea, or a 1-2 package teabag. If you cook with pots, tea and water will separate according to the ratio of the amount of tea into the pot. 3. equivalent tea into the cup, and then into the boiling water. If it is high-grade tea, then, in order to use white porcelain cup is appropriate to wind blows. Usually flush to eight full. If the pot boiling, then water should be boiled first, then put the tea ingredients. Avoid eating: drug use tea delivery service; do not drink tea before and after taking 1 hour. Ginseng should not be eaten with tea. Avoid drinking tea hangover; should not drink tea before meals; bogey immediately after dinner tea; girls avoid drinking tea.