Equal parts of 10 & 30 V. developer will yield 20 v.
Mixing 10 Volume developer and 40 volume developer will never make a 20 volume regardless of how much is mixed. In order to make a 20 volume, equal parts of 10 and 30 volumes will need to be mixed. Mixing 10 and 40 will make 30 volume.
2.6 oz of developer.
It won't make it 30. The way developer works is 10 is no lift deposit only and makes hair semi permanent. 20 is 7-10 shades of lift with deposit and makes hair colour permanent. You have to buy 30 volume developer from a sallys beauty supply but 30 is very dangerous for the hair it can damage it severly I recommend sticking to just 20 volume
Equal parts of 10 & 30 V. developer will yield 20 v.
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.
Not much.
Redken Shades EQ should be mixed with Redken Shades EQ Processing Solution. This line does not require 30 volume developer.
Use equal parts of color and developer. For 2 ounces of color, mix 2 ounces of developer unless otherwise stated in the manufacturer's directions.
Developer and color require an equal parts mixture. If you are using two ounces of color, you would need to use two ounces of developer.
Almost always the mixture is equal parts developer and color. For example, 2 ounces of color + 2 ounces of developer.
this sight sucks
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