New York State Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Permanent color is typically used for covering gray hair because it provides long-lasting results and effectively penetrates the hair shaft. This type of dye contains ingredients that allow the color to remain in the hair until it grows out or is cut off, making it ideal for clients who want a full, even coverage of gray strands.

In contrast, temporary color only coats the hair's surface and can wash out after one shampoo, making it insufficient for lasting gray coverage. Semi-permanent color, while it can provide some gray coverage, typically lasts for a shorter duration and may not fully cover gray hair, particularly if it is stubborn or has a coarse texture. Highlighting color is focused on creating lighter strands and is not designed to cover gray hair, as it does not provide an all-over color solution. Therefore, for effectively covering gray hair, permanent color is the most suitable choice.