Puerh History - Pu-erh.Net

„Yunnan Tea Company standardized the trade number for Pu Erh Tea in 1976 for the purpose of export. Each bingcha has 4 digits: the first 2 digits indicate the manufacturing year, the third digit indicates the leaf grade, the last digit indicates the tea factory (e.g. Kun-Ming 1, Meng-Hai 2, Xia-Guan 3, Pu Erh 4). The loose-leaf tea has 5 digits with the third and fourth indicating the class level of raw materials. Examples of early trade numbers for Puerh Tea are 7452, 7562, 7572, 75671, 76563.“

„yun; 韵. Charm, appeal, allure. A difficult term to render into English as it refers to a quality of tea that 'cannot be apprehended by the five senses.' Generally used with hou; 喉 - throat. Hou yun. A pleasant feeling that lingers in the throat after swallowing tea. Distinct from hui-gan. “