What is the ideal pH level for shampoo designed for color-treated hair?

The ideal pH level for shampoo designed for color-treated hair is between 4.5 and 5.5. This pH range is slightly acidic, which is beneficial for maintaining the integrity and vibrancy of color-treated hair. The acidic nature of this pH level helps to close the hair cuticle, reducing damage and helping to lock in color, which can be compromised by products that are too alkaline.

Using shampoos within this range promotes a healthy scalp environment and prevents stripping the hair of essential oils and moisture, which is particularly important for color-treated hair that may already be more vulnerable to dryness and damage. On the other hand, shampoos with a higher pH can open the hair cuticles, leading to color fading and increased porosity. This is why the pH of 4.5 to 5.5 is recommended for those looking to maintain their hair color effectively.