Yes it totally looks like black tea, but it's not. It's sits somewhere between Black Tea and Green Tea. They have a wide range of oxidation levels, spanning the wide gap between green tea (zero oxidation) and black teas (full oxidation).
Origins of Oolong Tea
While China is the birthplace of oolong teas (dating back to China's Ming Dynasty like all classic tea varieties), they are now produced in a wide variety of countries, including Taiwan, Vietnam, India, and more.
Oolong Manufacturing Techniques
Oolong teas are among the most complex teas to create, involving a variety of intricate processes to achieve the desired outcome. Beyond the oxidation level of the resulting tea, the degree of withering, rolling/shaping, firing, and post-production baking all contribute to the final leaf style and flavor/aroma characteristics.
The Possible Health Benefits of Oolong Teas
Oolong teas haven’t been studied quite as much as green, white, or black teas have, but there are a few areas of interest that researchers are looking into. For example, many in China have long believed in the ability of oolong teas to increase metabolism and oxidize fat.