Which type of hair color does NOT require a developer?

The type of hair color that does not require a developer is temporary hair color. Temporary hair color is designed to coat the surface of the hair shaft and typically lasts for a short duration, usually until the next wash. It does not penetrate the hair cuticle or require a chemical activator, making it ideal for those looking for a quick change in color without a long-term commitment.

In contrast, semi-permanent, demi-permanent, and permanent hair colors all necessitate a developer. Semi-permanent hair color can deposit color into the hair but requires a low-volume developer to enhance the penetration of the color. Demi-permanent hair color, which offers longer-lasting results than semi-permanent, also uses a developer to facilitate the color's ability to last longer than a temporary option. Permanent hair color requires a developer as it is formulated to lift the natural hair color and deposit the new color deep into the hair, resulting in a long-lasting change. Thus, temporary hair color stands out as the only option that does not use a developer in its application process.