OYA Lotion Developer Choose Your Volume

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