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