What is the impact of a high pH shampoo on the hair?

A high pH shampoo typically has a pH level above 7, making it alkaline. When such a shampoo is applied to the hair, it raises the cuticle layer, which is the outer protective layer of each hair strand. This lifting of the cuticle occurs because the alkaline nature of the shampoo causes the scales of the cuticle to open up, allowing for better penetration of cleansing agents and facilitating the removal of dirt and oils from the hair.

This characteristic of high pH shampoos can be beneficial for thorough cleansing, especially for removing product buildup. However, it can also lead to negative effects, as an open cuticle can make the hair more susceptible to damage, moisture loss, and frizz. This is why it's essential for clients to be aware of their hair type and condition when selecting products, as high pH shampoos are not suitable for all hair types.

The other choices, such as hydration of hair, sealing the cuticle, and even distribution of color, do not accurately represent the effects of a high pH shampoo. Hydration and sealing the cuticle are generally associated with conditioners or low pH products, which help to smooth and close the cuticle for healthier hair.