What does the "crack" signify during the coffee roasting process?

• A. It indicates the coffee is over-roasted
• B. It shows the beans are cooling
• C. It marks the transition to a new roasting phase
• D. It signifies the end of roasting

Answer: (C)

The "crack" during the coffee roasting process is a crucial auditory and physical signal that indicates the beans have reached a significant transition in their roast profile. Specifically, it marks the point when the moisture inside the beans has turned to steam and the pressure builds up, leading to the first expansion or "crack." This moment is indicative of the beans moving into a new roasting phase, where they undergo important chemical changes essential for flavor development.

The first crack is generally associated with the beginning of the light roast phase, while subsequent cracks can indicate reaching darker roast levels. Understanding the crack helps roasters determine how to proceed with the roasting process and affects the final flavor characteristics of the brewed coffee. Recognizing this transition allows for better control over the roasting profile, ultimately influencing the taste attributes of the coffee.