Chinese scientists have tested the effectiveness of determining the quality (and price) of young tea leaves, used to produce Yulu tea, from Enshi with the help of infrared spectroscopy and subsequent processing of the least squares obtained by this method. In the course of the experiment, 108 samples of tea raw materials were selected — they were buds, buds and one leaf, buds and two leaves and buds and three leaves. These samples were evaluated by specialists, then some of them were used to calibrate the system, and the remaining ones were used to test the efficiency of the method. In 97% of the cases, the “infrared spectrograph + least square algorithm” system determined the quality and price of tea correctly.
Enshi Yulu tea is a famous steamed green geographical-indication tea, produced in the Enshi autonomous region of Hubei province; the protection scope is located in Bajiao Dongzu Township (450 to 850 m above sea level) in Enshi City.