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