Which technique is used to change natural hair color while covering gray and adding lighter strands?

The technique known as Tone on Tone is specifically designed to change the natural color of the hair while effectively covering gray strands and introducing lighter highlights. This method involves using a semi-permanent or demi-permanent hair color that matches the natural shade but deepens it or enhances it with reflective or lighter pigments.

Tone on Tone not only provides coverage for gray hair but also adds dimension through its ability to create subtle variations in color. It results in a more natural look, as the color tends to blend well with the natural hues of the hair, allowing for a softer transition rather than a stark contrast.

The other techniques, while related to coloring, do not fulfill all these aspects. Shadowing and shading typically refer to creating depth and dimension within a single color rather than changing the base color or covering gray. Streaking is a highlighting technique introducing lighter strands but is less effective for comprehensive gray coverage or altering the overall natural color.