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you use 20 volume developer on gray hair
20 or 30 Volume developer is recommended for blonding.
20 volume.
For optimal gray coverage, a 20 Volume Developer should always be used.
20 Volume developer should be used when toning hair.
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.
30
30 Volume Cream Developer is generally used for high-lift color, blonding, and bleaching.
20 volume