What does 'chaff' refer to in the context of coffee roasting?

• A. The developed oil on the surface of roasted beans
• B. The flavor notes present in different coffee types
• C. The papery skin that comes off the coffee beans during roasting
• D. The method of brewing coffee

Answer: (C)

In the context of coffee roasting, 'chaff' specifically refers to the papery skin that separates from the coffee beans as they are heated and roasted. During the roasting process, the coffee beans undergo significant changes, and one of these changes involves the expansion and separation of this outer layer of parchment. As the beans reach higher temperatures, the moisture inside causes them to expand, and the chaff detaches.

Understanding chaff is important for roasters because it can affect both the quality of the roast and the flavor of the final brewed coffee. If not properly managed, chaff can create a messy roasting environment and potentially impart unwanted flavors into the coffee. Additionally, it is often a consideration in the cooling process, as chaff needs to be removed to ensure even cooling of the beans and to maintain cleanliness in the roasting area.

The other choices do not accurately describe chaff. The developed oil on the surface refers to coffee oils that contribute to flavor and mouthfeel, flavor notes pertain to the distinct tastes identified in coffee, and brewing methods involve the techniques used to extract flavors from roasted coffee.