20 or 30 Volume developer is recommended for blonding.
20 volume.
20 Volume developer should be used when toning hair.
For optimal gray coverage, a 20 Volume Developer should always be used.
Yes, you can use a 15 volume developer with demi-permanent ammonia-free hair color to cover and blend greys while slightly lifting the base color. The 15 volume developer provides enough lift for subtle color changes and helps the dye penetrate the hair effectively. However, keep in mind that the results may vary based on your hair's porosity and current color. Always perform a strand test to ensure desired results.
20 Volume developer should be used to completely cover gray hair and process for at least 45 minutes.
you need a 10 or 20 developer. Nothing higher. Since your going from light to dark you dont need to use a strong developer to lift color out.
depends on if you are going lighter or darker. If darker use a 10 if lighter use a 20
A 20 volume developer will be sufficient for coloring facial hair, especially if there are some grays mixed in.
To create a 30 volume developer solution with a 40 and 30 volume developer, you can mix equal parts of each developer together. For example, mix 1 part 40 volume developer with 1 part 30 volume developer. This will result in a 35 volume developer solution, which is close to 30 volume. It is important to perform a strand test before using the mixed developer on your hair to ensure it is the desired strength.
No, you cannot physically change the volume of developer once it has been formulated. The only way to achieve a 30 volume developer is by diluting the 40 volume developer with distilled water or a low-volume developer. However, this may affect the performance of the developer.
30