Color change in blooming spices indicates that the spices are releasing their essential oils and aromas, enhancing the flavor profile of the dish. It's a visual cue that the process is working.
Blooming spices involves gently heating them in oil or butter to release their volatile aromatic compounds. As the spices heat up, their color typically changes. For example, cumin seeds might darken slightly, chili flakes might become more vibrant, and turmeric powder will become more fragrant and release its color into the oil. This color change is a direct result of the heat breaking down the cell walls of the spices and releasing the flavorful oils within. The oil then becomes infused with these flavors, which are then distributed throughout the dish. Without this blooming process, the spices might not fully impart their flavor, resulting in a less complex and aromatic final product. The color change is a visual indicator that this flavor release is happening.
Be careful not to overheat the spices, as this can cause them to burn and become bitter. Keep the heat low to medium and watch the spices closely, stirring frequently, until they become fragrant and the color changes slightly. Burnt spices will ruin the flavor of your dish.