What method is most commonly utilized for coloring gray hair?

The most effective method for coloring gray hair is the use of permanent hair color. This is primarily because permanent hair color provides full coverage and is specifically formulated to penetrate the hair shaft, which is essential for completely covering gray strands. Gray hair tends to be more resistant to color, so a lasting solution is required to ensure that the color adheres and remains vibrant over time.

Temporary hair color, while useful for providing a quick change or enhancement, does not offer the longevity needed to cover gray hair effectively as it typically washes out after a few shampoos. Highlighting involves lightening specific strands of hair to create dimension, making it less suitable for those looking to cover the entirety of their gray hair. Balayage is a technique for adding softer highlights and is not designed for gray coverage. Therefore, the comprehensive and durable nature of permanent hair color makes it the preferred choice for addressing gray hair.