Which element can overly dark roasted coffee impart?

Overly dark roasted coffee can impart bitterness due to the roasting process itself. During roasting, the beans experience significant changes as the sugars caramelize and begin to burn. This burning can lead to compounds being produced that result in a bitter taste, often overwhelming the more subtle flavors in the coffee. As the roast level increases, these bitter compounds become more pronounced, which can mask the original character of the coffee beans.

In contrast, elements like fruity notes, acidity, and sweetness are typically more prominent in lighter roasted coffees where the intrinsic flavors of the beans are preserved. A dark roast tends to diminish these qualities, focusing instead on the bolder, more bitter aspects resulting from the roasting process. This understanding is crucial for appreciating the complexities of coffee roasting and how it impacts the flavor profile of the final brewed beverage.