What is the role of pH in hair coloring?

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The role of pH in hair coloring is crucial because it impacts the hair's cuticle layer and determines how well color is absorbed. The cuticle is the outermost layer of hair, consisting of overlapping scales that can open or close depending on the pH of the environment. When the pH is raised, which often happens with color formulas, the cuticle opens, allowing the color molecules to penetrate the hair shaft more effectively. This ensures that the hair can absorb the color as intended, resulting in a more vivid and long-lasting hue.

In contrast, if the pH level is not properly balanced, the cuticle may remain closed, limiting color absorption and leading to less effective coloring results. Additionally, maintaining the appropriate pH balance is important for hair health, as extremes in pH can damage the hair structure over time. This understanding of pH's role helps cosmetologists apply hair coloring techniques effectively while also considering the health of the client's hair.

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