Hair dyeing is the process of changing the color of hair using various chemical or natural products. It can be done for aesthetic reasons, to cover gray hair, or to express personal style. There are different types of hair dye, including permanent, semi-permanent, and temporary options, each with varying levels of longevity and intensity. The dyeing process typically involves applying the dye to the hair, allowing it to set for a specific time, and then rinsing it out. Common ingredients in hair dye include ammonia and peroxide, which help to open the hair cuticle and deposit color. Natural alternatives, such as henna, are also popular for those seeking chemical-free options.