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How to Choose a Hair Developer: Volume Strength, Application, & More
Select a 10-volume developer to lift your hair by 1 shade. Volume 10 developer is the gentlest option and is best for minor hair color changes like brown to black.
Choose a 20-volume developer to lift hair by 2 shades and help cover greys.
Go for a 30-volume developer to lift your hair 3-4 shades. Only use volume 30 hair developer on thick or coarse hair, as it's too harsh for fine hair types.
Avoid using a 40-volume developer, which can damage your hair.