This is difficult to answer without seeing your hair and knowing its texture and whether or not there's any presence of artificial color. With that said and for the most part.... yes, 30 volume would be better to use than 20 volume for a blonde shade.
Equal parts of 10V. Developer + 20V. Developer= 15 Volume Developer
It will lift colour three levels above a base 6 (dark blonde) and it lighten hair two levels below a base 4 (brown).
What is the difference between 10 and 20 volume creme developer?
Equal parts of 30V + 40V= 35V.
Mixing equal parts of 20 V. and 40 V. developers will give you an approximate 30 volume developer.
Quick question how long do you let it sit there before doing the dye?
creme developer is thicker and more conditioning Also.......Clear developer is mainly used when coloring out of a bottle and cream is used when coloring with a bowl & brush.
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.
Mixing equal parts of 20 V. and 40 V. developers will give you an approximate 30 volume developer.
Any brand cream developer can be used with a color as long as it is mixed according to the manufacturer's directions and it is the appropriate volume.
Max huber
20 vol