Which hair color category uses a developer to achieve lift?

The category of hair color that uses a developer to achieve lift is permanent hair color. Permanent hair color contains an alkalizing agent and requires a developer or oxidizing agent to open the hair shaft and allow the color to penetrate deeply. This chemical reaction not only alters the hair's natural pigment but also creates a lasting change that doesn't wash out.

The use of a developer is crucial because it activates the color and ensures that the dye binds effectively to the hair, resulting in a long-lasting color that can cover gray hair and lighten the natural shade. This process contrasts with semi-permanent and temporary colors, which do not require a developer and therefore cannot achieve significant lift or long-lasting coverage. Direct dye colors similarly do not utilize a developer, as they are designed to coat the hair's surface rather than penetrate or alter its structure.