Developer and Peroxide

How to choose the level of developer:
Use 10 Vol if you want same level-on-level coloring, for toning blonde highlights without lifting, and for tone-down coloring
Use 20 Vol if you are aiming for a 1-2 level lift.   Great for grey coverage or change your shade warmer or cooler within the same level-on-level colouring.
Use 30 Vol is you are aiming for a 2-3 level lift and more vibrant shade
Use 40 Vol if you are aiming for a 3-5 level lift and if the hair is particularly difficult to color.  However, use with caution.
NOTE: The mixing ratio of your color should always be respected.

Developers are designed to last up to three years, it is best to discard hair dye developer after 18 -24 months.

We recommend storing your developer in a cool and dry place such as a bathroom cupboard or closet. Additionally, make sure that you keep the bottle tightly sealed when not in use.