Define 'complementary colors' in the context of hair color.

Complementary colors refer to hues that are located directly opposite each other on the color wheel. In hair color, utilizing complementary colors can create dynamic contrasts and enhance the overall appearance of the hair. For example, if you have hair that features warm tones, applying a color from the cool side of the wheel can help to neutralize unwanted hues and create a balanced look. This principle is crucial for color correction and enhancing visual interest in hair design. Understanding complementary colors allows cosmetologists to make informed choices that can lead to more aesthetically pleasing results for their clients.