There are 4 or 5 digit numbers on the back of each green tea box. I know they are used to classify the type of tea and its quality, but I have never found how to read them. How do I figure out which one is higher quality than another one. Here are examples:
Chunmee tea Series: 41022AAAA, 41022AAA, 41022AA, 41022, 4011, 9371, 9370, 9369, 9368, 3008, 34403
Gunpowder Tea Series: 3505A, 3505B, 3505C, 9372, 9373, 9374, 9375, 9475, 9575