What pH level is required for chemicals to penetrate a healthy cuticle hair layer?

Chemicals that are intended to penetrate the healthy cuticle layer of hair typically require an alkaline pH level. Alkaline substances raise the pH level, which causes the cuticle layer—to lift and open—thereby allowing these chemicals to effectively enter the hair shaft.

In cosmetology, this principle is particularly important for processes such as coloring or perming hair, where the cuticle needs to be opened so that the dye or perm solution can reach the inner cortex of the hair. The raised cuticle allows for better absorption, leading to more effective results.

Neutral pH does not provide the necessary condition to raise the cuticle and may inhibit penetration. Acidic pH tends to close the cuticle, which would prevent chemical absorption, and a basic pH, while indicative of alkalinity, is not as commonly referenced in this context as alkaline pH. Understanding these pH levels is crucial for hairstylists and cosmetologists when selecting the right products and techniques for their clients.