Always use OYA lotion 10 volume (3%) for gray coverage, coloring tone-on-tone, and coloring darker.
OYA lotion 10 volume guarantees long-lasting gray coverage.
OYA lotion maintains hair quality and structure.

Mixing ratio 1:1 (1 part color with 1 part OYA lotion).

4 dedicated lotion for use with OYA Permanent Color:
10 volume (3%) for all gray coverage and deposit only
20 volume (6%) up to 2 levels of lift
30 volume (9%) 2 to 3 levels of lift
40 volume (12%) 3 or more levels of lift

1 dedicated lotion for use with the OYA Demi Permanent Color: 5 volume (1.5%) deposit only.