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Coffee Roaster From raw coffee beans that are tasteless and aromatic. Coffee roasting is the process of bringing coffee beans through heat to cause changes within the beans, especially the oils that will evaporate. It also causes various reactions, such as sugar in coffee beans that react with the heat from roasting. There are three levels of coffee roasting: light roast, medium roast, and dark roast. The difference in coffee roasting helps create a unique identity for coffee. Because the roasting level of coffee beans affects the taste, sourness, sweetness, bitterness, and aroma.