Which type of relaxer contains only one component and requires no mixing?

The type of relaxer that contains only one component and requires no mixing is the metal hydroxide relaxer. This type of relaxer is ready to use straight from the container, which simplifies the application process for the stylist. Metal hydroxide relaxers often contain ingredients like sodium hydroxide, potassium hydroxide, or lithium hydroxide, which work to break down the disulfide bonds in the hair, leading to a straightening effect.

Other relaxers, such as ammonium thioglycolate relaxers and alkaline relaxers, typically involve more than one component and require mixing before application. This mixing is necessary to activate the chemical processes that will alter the structure of the hair. Acid-base relaxers also require a combination of components for their functionality. Therefore, the characteristic of being a single-component product is what specifically defines metal hydroxide relaxers as distinct in the context of chemical texturizing.