This is a relatively new tea from Tian Mu mountain 天目山 in An Ji 安吉县. The tea is also known as An Ji White Tea, but despite the name, this is a green tea. The reason for the name is that the fresh tea leaves are almost completely white.
There is a legendary tea tree described in Da Guan Cha Lun 大观茶论 that would have completely white leaves. In the 1980s it was found that white tea tree in the area An Ji, Zhejiang which experts in China believe is the bush that was mentioned in the book. Tea plant, which is now called “Ancestor of Bai Cha,” cloned fairly soon to a shrub called Bai Ye # 1 (White Leaves # 1) which is used for commercial production. One of these commercial teas are An Ji Bai Cha.
The reason why the white color because the leaves have unusually low concentration of chlorophyll and polyphenols but contains almost twice as much amino acids other green teer.