*note- The first half inch of root always bleaches way faster than the rest. This is because it is so close to the scalp and much warmer, and heat activates bleach to work faster.
*another note-The volume of developer you use, 10,20,30, or 40, determines the speed at which it lightens. It is possible to achieve the same level of lift with a 10 as with a 40, it just takes more time and more heat. This is important to remember, as the volume of developer can be changed halfway through a bleach job to compensate for working slowly.
