What is the definition of "undertone" in hair color?

The definition of "undertone" in hair color refers to the underlying hue that influences the overall color. Undertones are often subtle and can be cool, warm, or neutral, affecting how the primary color is perceived and how it interacts with natural hair tones. This foundational characteristic is crucial for colorists when formulating hair color to ensure that the final result complements the client’s skin tone and desired look.

Understanding undertones helps hair professionals create customized hair color that truly enhances their clients' beauty, rather than merely applying a color that may not align with their natural characteristics. This aspect of hair coloring is essential for chromatic accuracy, leading to a more harmonious overall appearance.