Hair colorists, also known as dyers, are professionals who specialize in changing the color of hair. They use a variety of techniques to create the desired look, such as bleaching, highlighting, and tinting. Hair colorists must have an eye for color and be able to mix and match shades to achieve the desired result. They must also be knowledgeable about the latest trends in hair color and be able to advise clients on the best options for their hair type.