what volume developer
If you're going darker, you should use 10 developer. 20 – 40 developer can be used to lift 1-4 levels. 20 developer is best for grey coverage. Does 30 ...
If you're going darker, you should use 10 developer. 20 – 40 developer can be used to lift 1-4 levels. 20 developer is best for grey coverage. Does 30 ...
