Black Tea and Earl Grey Tea are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Black Tea and Earl Grey Tea's differentiating factor?In following section we will take a close look at what is Black Tea and Earl Grey Tea color, serving style, types and much more. First thing to know is what are the different types of Black Tea and Earl Grey Tea. Well, Black Tea types include Tanyang Gongfu, Zhenghe Gongfu, Zhengshan xiaozhong, Earl Grey Tea while types of Earl Grey Tea are Herbal.