Dying hair a natural or unnatural color works best after bleaching it according to Clairol. For the healthiest results, avoid using permanent dyes, as they can further damage the hair. The most common dyes used after bleach are semi-permanent and demi-permanent.
Bleach removes the pigment from hair and leaves it very porous. This allows the dye to easily enter the hair shafts. Bleached hair is permanent until the hair grows out. The only way to restore color to bleached hair is to apply hair dye.
Bleach damages the hair, but the damage is minimal when done with care. Repeated bleaching and dyeing can permanently damage hair. Minimize the damage by only coloring hair occasionally or by consulting with a professional to complete the process.