If your bleach and developer come with instructions on how to perform an allergy test, follow those instructions.
You may want to add a tad bit more in case you need to add a bit more bleach to your hair. Most shampoos are fine to use but do not use a toning shampoo.
Using a 30 or 40 developer can break or snap re-treated hair, so use with caution! Developer comes in many volumes with lower numbers being weaker and 40 being the strongest.
Add conditioner. This step is optional, but recommended to keep hair healthy. However, do not add conditioner if you are planning on dyeing your hair directly after bleaching it.
You can also let your hair air dry for several minutes in combination with towel drying it. Bleach can be applied to wet or dry hair. You should use whatever approach is more consistent with your level of bleaching experience. Your bleach will likely go best if you use a method you are comfortable with.
It’s okay to apply the mix only to certain spots on your hair (like where the color didn’t work out like you wanted it to. )
For already bleached hair, you may only need 7 - 10 minutes. For removing a dark dye, you may want to process it longer than 10-15 minutes, though it should only be 30 minutes maximum. If you do decide to use 30 or 40 vol - for extra lift or speed - don’t let it process longer than 7-10 minutes (depending on your hair color and condition).
If you’re trying to remove hair dye, your hair should look orange or yellowish. If you’re trying to remove a toner, it should leave the hair yellow.
