How do you choose a hair dye developer?

Question

im dying my hair with ion color brilliance hair dye. my hair is natrually medium brown, and im dying it dark brown 3.0. how do i know what developer to use? i want my hair as dark as possible with the dark brown hair dye

Answer 1

I am not familiar with that brand.  But using a 10 vol developer or less will give you the deposit you are looking for.