What service involves the application of color to hair?

The application of color to hair is best described by hair dyeing. This process specifically involves using products designed to change the overall color of the hair, and it can range from subtle shades that enhance natural color to vibrant, bold hues. Hair dyeing can be achieved using permanent, semi-permanent, or temporary dyes, and it involves even distribution of color throughout the hair strands for a unified look.

While hair highlighting does involve color application, it generally refers to lightening specific sections of hair rather than the overall coloring process. Hair perming and waving pertain to altering the hair's texture and curl pattern rather than adding or changing color. Therefore, hair dyeing is the most precise term for this service.