Nevada State Board of Cosmetology Practice Exam

Single-process hair color refers to the technique of coloring the hair in one step, achieving a change in color without the need for any lightening beforehand. This method is typically used to apply a solid color or to cover grey hair effectively. It allows for a uniform color that can add richness and depth to the hair.

The correct choice emphasizes that the process occurs in a single application without involving any lightening agents. This is crucial for clients looking for a natural, glossy look that is consistent from root to tip.

In contrast, options that involve highlights or multiple shades imply a more complicated technique that includes varying colors or lightening processes, which does not apply to single-process color. Additionally, double-process color involves both lifting (lightening) the hair and then applying a color, which is entirely different from the single-process technique.