Applying hair color is a common beauty practice that involves using DYES to change the color of one's hair. DYES are a type of coloring agent that can be used to achieve a variety of shades and hues. The process of applying hair color typically involves mixing the dye with a developer, which helps the dye penetrate the hair shaft and adhere to the strands. Once the dye has been applied, it must be left on for a certain amount of time before being rinsed off.