A tea cake from menghai factory always has a mark number. When we buy an original basket of tea ( 12 packages or 84 cakes), a big paper ticket comes with and it shows the information of the factory, weight, and the mark number, like 7542, 7532, 7582,7572,7433 , etc.
People would ask what are these mark numbers telling us about? And what is relationship with tea grades?
The fist two digits tells the year the factory start using that formula
The third digit tells the grade of leaves mainly used.
The last digit tells which factory made the tea cake.
For example: 7542
75: The formula of 1975
4: the cake use different grades of leaves, but mainly use the 4 grade.
2: is the mark of menghai factory.