What term describes the process of coloring hair back to its natural color?

The process of coloring hair back to its natural color is accurately referred to as "tint back." This term specifically pertains to the technique of applying a color that resembles the individual's original hair shade, effectively restoring the hair to its natural appearance. This process is often used when someone has previously dyed their hair and wishes to return to their natural tone, either for aesthetic reasons or to help manage the grow-out phase of colored hair.

The other concepts in the list do not align with the definition provided. Color correction generally involves addressing issues that arise from previous hair coloring, such as correcting unwanted tones or fixing uneven color, rather than simply reverting to natural color. Color matching is about achieving a close resemblance to a desired shade but does not specifically imply returning hair to its natural state. Balayage is a highlighting technique that creates a graduated, natural-looking effect but does not pertain to coloring hair back to its natural color. Therefore, "tint back" is the most precise term for this specific process.