Green coffee beans arrive at the roasting facility in large burlap bags to begin a life changing process that will alter their taste, color and aroma making them into a world-wide cultural icon. When roasted, the green coffee beans expand and change in color, taste, smell, and density. Sugars begin to caramelize; colors begin to change from light to golden brown, to medium brown, dark chocolate then black. Science and art combine to bring the best characteristics out of each bean. Dark espresso roasts maximize the sweetness and aroma while minimizing the bitterness and acidity. Italian roasters like Lavazza and Illy seem to be able to coax the best of the beans creating a true metamorphosis.