Developers (Hydrogen Peroxide) are responsible for both lightening and deposit.
The amount of lightening listed below is approximate and is affected by the texture and natural color of the hair.
There are 4 chromastics developers
10-Volume for less lightening
10-Volume for use with Deposit-Only
10-Volume for use with Liquid Shades
20-Volume for standard lightening
25-Volume for resistant hair
40-Volume for extra lightening
30-Volume is created by mixing equal parts of 20-Volume and 40-Volume.
All chromastics colors and lighteners are mixed in a one-to-one ratio.