What is typically the first visible sign that coffee beans are roasting properly?

• A. The color changing to dark brown
• B. The appearance of cracks in the beans
• C. The aroma becoming more pronounced
• D. The beans swelling in size

Answer: (B)

The first visible sign that coffee beans are roasting properly is indeed the appearance of cracks in the beans. During the roasting process, coffee beans go through a transformation known as the Maillard reaction, where heat causes significant changes in both chemical structure and physical appearance.

As the temperature rises, the moisture inside the beans turns to steam, creating pressure that eventually leads to a physical expansion of the beans. This is often seen as a crack, which is a critical benchmark in the roasting process. The first crack occurs when the beans reach approximately 196-205°C (385-401°F) and indicates that the coffee has reached a certain stage of development, commonly referred to as the light roast stage.

While the other options—color change, aroma, and swelling—are also important aspects of roasting, they typically occur after the first cracks are audible. Witnessing these cracks serves as an immediate and clear indicator that the beans are progressing correctly through the roasting stages.