NOCTI Cosmetology Practice Exam 2025 – Comprehensive Prep Guide

Lightened hair typically requires a shorter processing time in permanent waving due to its altered structure and porosity. When hair is lightened, the cuticle layer becomes more open, allowing for quicker penetration of the waving solution. This increased porosity means that the chemicals in the perm solution can work more effectively and rapidly, leading to a faster reaction compared to untreated or coarser hair types.

In contrast, coarse, curly, or thick hair generally requires a longer processing time. Coarse hair has a denser structure, which can resist the chemicals for a longer period, and thicker strands may also need additional time to ensure uniform curl formation. Curly hair can sometimes be resistant to changes, and depending on the existing curl pattern, it may take longer for the perm solution to achieve the desired results.