30
you can but it will make your hair extremely orange or brassy. It would be better for you to use bleach with the 20 volume developer..20 volume does the least amount of damage to your hair..just be sure to build the strength of your hair back up with conditioning treatments.
you use 20 volume developer on gray hair
20 Volume developer should be used when toning hair.
No, it lifts your natural hair color by use of the developer. The higher the volume of the developer the more lift you will get in your hair.
When used alone, developer will do nothing to the hair. It is made to be mixed with a hair color.
A 5 or 10 volume developer are best for darkening, or depositing, hair color.
A 20 volume developer will be sufficient for coloring facial hair, especially if there are some grays mixed in.
20 or 30 Volume developer is recommended for blonding.
40 Volume developer is not recommended to use when bleaching hair as it is very strong and can cause major damage if not done by a professional. 20-30 volume would be better and safer for home use.
For optimal gray coverage, a 20 Volume Developer should always be used.
Yes, the appropriate volume developer must be mixed with any Matrix color.
No, it would be preferable to use 20 volume developer when going from dark brown to black hair color.