Yun is a complex concept. While it can be literally translated as “charm," the yun of a tea is more than simple appeal – yun is what makes the tea powerful and lingering beyond the common concept of aftertaste. Only the finest teas have a perceptible quality that would be described by professional Chinese tasters as yun. While there is no complete agreement on how to put "yun" into words, we notice a light cooling sensation and a tingling almost electrical texture on teas that have yun. This feeling builds up with every sip, making subsequent steepings more and more commanding. Master Zhang creates this through careful charcoal roasting over several long sessions and many days, relying on his experience and senses to get the finish perfectly right.