What do you call the undesirable reddish, orange, or golden hues that may appear in hair after coloring?

The term used to describe the undesirable reddish, orange, or golden hues that may appear in hair after coloring is brassy tones. These tones often emerge when hair is lightened or when certain pigment undertones are revealed during the coloring process. For instance, if a client attempts to achieve a blonde shade but the underlying pigments are not effectively neutralized, the result may lead to an unwanted warm hue rather than the desired cool or neutral tone.

Brassy tones are particularly common in individuals with naturally dark hair, as dark hair typically has strong underlying warm pigments. Understanding this phenomenon is crucial for colorists, as it emphasizes the importance of using the correct color formulations and techniques to achieve the intended hair color without these unwanted undertones. This may include using specific toners or color correction methods to counteract the brassy appearance.

Other options such as bonds and breakage are terms related to the structural integrity of the hair itself, while build-up pertains to the accumulation of products on hair, affecting its overall appearance and texture but not specifically addressing unwanted color tones.