Corrective color refers to the process of adjusting or altering the color of the hair to achieve a desired shade, tone, or overall appearance. This typically involves correcting hair color that has been dyed incorrectly, unevenly, or in a way that doesn't meet the guest's expectations. Some methods used during a color correction reservation are removal of unwanted color, evening out of inconsistent hair color, adjusting undertones, and/or correcting previous hair color.