The meaning of A443 written on the tea seller is as follows:

The tea industry is strange and chaotic, and the quality of tea is uneven. The article numbers used by different tea factories and batches are inconsistent, which leads to many troubles in the supply and marketing business. In order to solve this difficulty, China Tea Company took the lead in proposing to standardize the commodity number and unify the commodity name, that is, an English letter represents a large category of oolong tea.

English letters stand for categories, C stands for Wuyi exotic species, H stands for bergamot species, K stands for Tieguanyin, S stands for color species, L stands for oolong, Y stands for northern Fujian narcissus and southern Fujian narcissus, and B stands for Wuyi narcissus.

the number stands for "mark", which has four digits and five digits. The "mark number" of Pu 'er cake tea is 4 digits, in which the first two digits represent the year when the tea was created, the third represents the grade of raw material raw tea, and the fourth represents the number of tea factory. For example, the "7572" cake tea with the "mark" of 4 digits can be interpreted as: Menghai Tea Factory selected tea cakes made of 7-grade crude tea in 1975.

Types of tea

1. Green tea

Green tea is made from the new leaves or buds of tea trees, without fermentation, through the processes of deactivating enzymes, shaping and drying, and retains the natural substances of the fresh leaves, including tea polyphenols, catechins, chlorophyll, caffeine, amino acids, vitamins and other nutrients. Green tea includes West Lake Longjing, Xinyang Maojian Tea and Anji White Tea.

2. Black tea

During the processing of black tea, a chemical reaction centered on the enzymatic oxidation of tea polyphenols occurred. The composition of fresh leaves changed greatly, and tea polyphenols decreased by more than 9%, resulting in new components and aroma substances such as theaflavins and thearubigins, which have the characteristics of black tea, red soup, red leaves and sweet and mellow flavor. Green tea includes West Lake Longjing, Xinyang Maojian Tea and Anji White Tea.

3. White tea

White tea, which is processed only by sun drying or slow fire drying, has the quality characteristics of complete appearance, full of hair, fresh hair in Qing Xiang, clear yellow-green soup color and light and sweet taste. White tea includes Baihao Yinzhen, Gongmei and Bai Mudan.

4. Yellow tea

Yellow tea belongs to light fermented tea, and its processing technology is similar to that of green tea, except that a "yellow-blocking" process is added before or after the drying process to promote the partial oxidation of polyphenols, chlorophyll and other substances. Yellow tea includes Mengding yellow bud and Huoshan yellow bud.

5. Oolong Tea

Oolong tea belongs to green tea and semi-fermented tea, with many varieties. It is a unique tea category in China, and it is a tea with excellent quality after picking, withering, shaking, frying, rolling and baking. Oolong tea includes Tieguanyin, Dahongpao and Fenghuang Dan Cong.

6. Black tea

Black tea is named for its black appearance. Black tea belongs to one of the six categories of tea, which belongs to post-fermentation tea. The raw materials of black tea used in traditional black tea have high maturity and are the main raw materials for pressing pressed tea. Black tea includes Anhua black tea and Liubao tea.