0: used when toning lightened hair to reduce risk of breaking base OR to achieve soft tonal reflects. Recommended to be used with instant tones.

1:can be used for toning lightened hair and creating soft tones on natural hair. Recommended for colour balancing.

2:can be used for grey coverage (up to 75% grey blending) and create more intense tonal results. Recommended to be used with Artisan Creative Colours.