it doesn't matter.
Haircolor Level
i have the loreal technique preference permanent haircolor "natural black #3" and i dont know how much of 20 volume creme to mix it with.
It must be distilled water but yes. You can combine equal parts distilled water and 40 volume to get 20 volume developer.
The volume of the developer simply tells you how many levels it will lift your hair so since you are using 30 volume, it will lift your natural color 3 levels higher to help the permanent color show better. The volume/color ratio is 1:1 which means however many oz. of haircolor you use, you put the same number of oz of developer. For example: 2oz permanent haircolor: 2oz of developer I hope this helps you! Source: I am a cosmetologist
Yes why not?
Grey
Not much. Of course, the exact amount of energy varies, depending on the sound volume.
brown
brunett
It depends on your natural color and the desired color. And a lot of other variables. Are you lightening your hair, covering grey or just going for a different color. Standard strength is 20 volume. Higher lift colors often require 30 or 40 volume. You should get a consultation with the establishment that sold you the haircolor. if you have colored your hair in the past and want to go lighter, you will need to remove the old haircolor first, usually with bleach. Haircolor will not lighten the artificial color molecules in your hair, only will lighten your natural color. If this is the case, I highly recommend going to a salon for your color. Good luck.
Blonde
dark brown/black