The difference between medium and dark roast coffee
Medium roast refers to the stage at which coffee beans reach a medium roast degree during the roasting process. This level of roasting usually creates some chemical changes within the bean, making the bean more acidic and distinct. Medium-roasted coffee beans typically have a light to medium brown appearance, with a slight oily sheen on the surface of the beans. Medium-roasted coffees typically have higher acidity and more pronounced fruitiness, with a refreshing palate with some floral and fruity aromas and a slight caramel flavor. This level of roasting is commonly found in some specialty coffees.
Dark roasting refers to the stage at which coffee beans reach the level of deep roasting during the roasting process. This degree of roasting usually produces more chemical changes on the inside of the bean, making the bean more bitter and full-bodied. Dark-roasted coffee beans typically have a dark brown to black appearance, with a noticeable oily finish on the surface of the beans. Dark-roasted coffees typically have lower acidity and a richer bitter-astringency, with a rich palate with some caramel and chocolate notes. This level of roast is commonly found in some Italian-flavored coffees.
The difference between medium roast and dark roast is mainly in the time and temperature of roasting. Medium roast has a short roast time and a lower roasting temperature, which preserves the acidity and flavor of the coffee beans to some extent. Whereas, dark roast has a long roasting time and a high roasting temperature to make the coffee beans more bitter and full-bodied.
Overall, the difference between medium roast and dark roast is the roast time and temperature, as well as the appearance, flavor, and mouthfeel of the beans. Medium-roasted coffees usually have higher acidity and more pronounced fruity acidity, and have a refreshing taste; Whereas, dark roasted coffees usually have lower acidity and a richer bitterness, resulting in a strong taste. With these points in mind, you can quickly pick out the coffee that suits your taste.