In an article titled, A study on chemical estimation of Pu-erh tea quality, Yuerong Liang et al found that the chemical composition of infused Pu-erh Tea and the sensory quality of the tea are correlated.
Chemical compositions and infusion colour differences of seven pu-erh tea samples and their correlation to sensory quality were investigated. The results [...]

Puerh is an aged tea from China that is fermented and matured to develop a unique mellow, slightly wet earthy character. The finest puerhs are aged for up to 50 years and become more mellow and soft over time. In China, this category of tea is considered to be a medicinal beverage that helps metabolize fats. It is ideal for digestion and is said to help prevent hangovers.