What is the typical pH range of hair coloring products?

The typical pH range of hair coloring products is generally between 9 and 10. This slightly alkaline pH is important for the hair color process, as it helps to open the hair cuticle. When the cuticle is raised, the hair’s inner cortex can absorb the color effectively. Alkaline products also contribute to the activation of the dye molecules, allowing for a more lasting and vibrant color result.

When the pH is too low, as is the case with options suggesting a range between 5 and 6 or 7 and 8, the cuticle would remain closed, inhibiting the penetration of color. Conversely, while hair coloring products can reach pH levels above 10, such as between 10 and 11, it is less common since extremely high pH levels can lead to hair damage and an unstable color result. Thus, the range of 9 to 10 balances effectiveness with safety for hair health.