Which of the following is NOT a common purpose of a chemical relaxer?

The choice that stands out as not aligning with the common purposes of a chemical relaxer is the one that refers to adding permanent color. Chemical relaxers are specifically formulated to alter the structure of curly or wavy hair, allowing it to become straighter and more manageable.

The primary objectives of using chemical relaxers include straightening curly hair, which helps in achieving a sleeker look, improving hair texture by making it smoother and easier to style, and managing frizz which can be a significant concern for individuals with textured hair. However, the function of adding color falls outside the realm of what chemical relaxers are designed to do. Coloring agents serve a different purpose, as they are meant to change the hair’s color rather than its texture or form. Thus, while chemical relaxers focus on altering hair texture and manageability, adding permanent color is a separate process that utilizes different products and techniques.