Yes, 30 volume developer is used if a person wants to go lighter. It lifts (or lightens) 3 levels.
10 volume developer is used to deposit hair color. if you have a lighter color and want to go darker you should used the volume 10.
darker!
you use 20 volume developer on gray hair
When used alone, developer will do nothing to the hair. It is made to be mixed with a hair color.
20 Volume developer should be used when toning hair.
Yes, but it wouldn't work as good you would have to use a lot more creme
The only thing that will occur when using 30 V. developer when coloring a dark color is that the color will not take as dark as it should. It will probably turn out to be a little lighter than expected.
It will remove the pigment from your hair and lift your hair color 3 times (lighten it).
Developer is used with professional color to adjust level of color desired. For example, black hair could be described as level 1, adding blonde highlights would require a 40 volume developer to lift the color of your hair 4 shade levels.
No, No you cannot. .... no you can't- but you can mix 10 with 30 volume! These strengths would equal 20 :)
I would say it depends on your hair type and what kind of developer you used
20 vol