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The purpose of a toner in the hair coloring process is specifically to adjust the tone of the hair after lightening. When hair is lightened, whether through bleaching or highlighting, it often can take on unwanted warm tones, such as yellows or brassy hues. A toner is formulated to neutralize these undesirable tones, allowing a stylist to achieve a more balanced and desired shade.

Toners contain color pigments that can counteract these warm tones—such as purple toners neutralizing yellow or blue toners neutralizing orange—resulting in cooler shades and a more refined look. This step is crucial for achieving the perfect finish, especially after a lightening service, as it helps enhance the overall color impact and ensures that the final result complements the client's preferences.

While toners may contribute to the appearance of shine and may be involved in overall hair care, their primary purpose is focused on tone adjustment post-lightening. Other options mentioned do not directly pertain to the fundamental function of toners in hair coloring.