20 volume developer typically lifts hair color one to two levels.
This means that if you're using a 20 volume developer with a hair color that's one level lighter than your natural hair color, you can expect to see a one to two level lift in your hair color.
It's important to note that the actual amount of lift you achieve can vary depending on a few factors, including:
- Your hair's natural color: Darker hair tends to require a higher volume developer for a noticeable lift.
- The hair color you're using: Some hair colors are formulated to lift more than others.
- The condition of your hair: Damaged or porous hair may lift more easily.
- Your hair's porosity: Porous hair absorbs color more easily, resulting in a more noticeable lift.
If you're unsure about which developer to use, it's always best to consult with a professional hairstylist.
