What is the "bloom" phase in coffee brewing?

The "bloom" phase in coffee brewing refers to the initial release of gas from wet coffee grounds. When coffee grounds come into contact with hot water, they release carbon dioxide that has built up during the roasting process. This release of gas creates bubbles and a frothy layer on the surface of the coffee, indicating that the coffee is fresh and the grounds are reacting to the water. This phase is essential because it allows for better extraction of flavors from the coffee grounds. If blooming is done correctly, it enhances the overall flavor profile of the brewed coffee, providing a more aromatic and flavorful cup. Understanding this phase is crucial for any coffee enthusiast looking to optimize their brewing process.