20 Volume (or 6%) developer will lift hair 2 levels and 40 Volume (or 12%) will lift hair 4 levels.
A 20 volume developer will be sufficient for coloring facial hair, especially if there are some grays mixed in.
40 volume developer is used for high lift shades and will lift hair 4 levels. 20 volume developer is also used for lifting but will only lift 2 levels. 20 volume is used as well when going darker or for gray coverage as it lifts and deposits at the same time.
I believe 1.5 parts would be 1.5 ounces of developer to 4 ounces of color, which doesn't seem like enough developer. Double check the directions. Usually haircolor is either 1:1 or 1:2 ratio. I've never heard of 4:1.5 ratio.
nothing! the only thing is that the ultra chi comes in various colors and the chi is in black. also, the regular chi is the first one to come out so its less advanced than the ultra and the ultra comes with tourmaline plates which is less damaging to your hair aswell.
between 2, 3, or 4 cm long
you use 20 volume developer on gray hair
30 volume developer will lighten the hair three levels.
20 Volume developer should be used when toning hair.
No you need the powdered bleach with the developer.
30
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.
The difference between the volumes of developers is that 20 volume gives 2 shades of lift, and 30 gives 3 shades of lift. If you are coloring you your hair darker than your natural hair you want 20 volume and also if your only going up 2 shades of your natural color you would use 20.
A 20 volume developer will be sufficient for coloring facial hair, especially if there are some grays mixed in.
A 5 or 10 volume developer are best for darkening, or depositing, hair color.
yes
20 or 30 Volume developer is recommended for blonding.