The conversation between human and AI assistant.
When should you use 10 volume developer for dying hair? How is it different from 20 volume developer?
When would it be better to use 20 volume developer instead of 10 volume developer?
It's best to use 20 volume developer if you want to significantly lighten your hair or if you have stubborn grays that are difficult to cover with lower volume developers. However, keep in mind that using higher volume developers can be more damaging to hair.