Which type of haircolor process typically involves both lightening and toning stages?

Double-process coloring is a method that involves two distinct stages: lightening the hair and then toning it. This technique is used to achieve a lighter hair color, often necessary for creating dramatic changes from dark to light shades or for achieving pastel colors.

In the first stage, a bleach or lightener is applied to strip the hair of its natural pigment, creating a pale base. After achieving the desired level of lightness, a toner is applied in the second stage to adjust the color and enhance the desired tone, such as neutralizing any unwanted brassiness or enhancing certain hues.

This two-step approach allows for greater customization and precision in hair color, making it a preferred technique for many stylists aiming for specific outcomes. In contrast, the other options, such as single-process coloring, typically involve either only lightening or depositing color without the need for a secondary toning step. Highlighting focuses on only lifting specific sections of the hair, and glazing primarily enhances shine and can add a hint of color without the lightening process.