Which tool is commonly used for applying hair color evenly?

A brush is commonly used for applying hair color evenly due to its design and functionality. The bristles of a hair color brush are specifically shaped to glide smoothly through the hair, allowing for even distribution of color from the roots to the tips. This tool also enables stylists to separate sections of hair easily, ensuring that the product is applied precisely and uniformly, which is crucial for achieving an optimal color result.

Using a brush allows for better control and can help to prevent overlapping on previously colored hair, which is important in achieving the desired shade and maintaining the integrity of the hair. This technique is vital in professional settings, where the desired effect is consistent and polished results throughout the application process.