What is the primary focus of complementary colors in hair color theory?

The primary focus of complementary colors in hair color theory is their ability to neutralize each other. Complementary colors are located opposite each other on the color wheel. When applied in hair coloring, using a complementary shade can balance out unwanted tones. For example, if hair has an unwanted brassy or yellow tone, applying a violet or blue hue can neutralize that warmth, leading to a more desirable color result. This principle is crucial for color correction techniques and helps hairstylists achieve a balanced and harmonized look, rather than simply enhancing or changing brightness or depth without addressing any color imbalance.