What occurs during the first crack stage of coffee roasting?

• A. The beans begin to cool down
• B. The beans expand and emit a cracking sound
• C. The beans are ground for brewing
• D. The roasting process stops

Answer: (B)

During the first crack stage of coffee roasting, the beans undergo significant physical and chemical changes, which lead to the expansion of the beans and the emission of a distinct cracking sound. This sound is caused by the rapid expansion of gases within the coffee beans as they heat up and the moisture inside turns to steam. The first crack typically happens around 196 to 205 degrees Celsius (385 to 401 degrees Fahrenheit) and signals a pivotal moment in the roasting process where the beans transition from the drying phase to the development phase.

At this point, the beans are not only expanding but also starting to develop flavor compounds that will contribute to the final taste of the coffee. It is an essential indicator for roasters, who may choose to stop the roast after this stage for lighter profiles or continue roasting for deeper flavors. The first crack is critical for assessing the roast level and achieving the desired characteristics of the coffee.