Hair dye can only be removed with bleach, so to remove permanent hair dye, apply a soap cap. If necessary, tone and re-color the hair. Removing permanent hair dye takes roughly 45 minutes plus re-coloring time and requires shampoo, hair bleach, conditioner and protective gloves. If re-coloring the hair, food coloring and hair color are also needed.
- Prepare the soap cap
In a color bottle, mix equal parts shampoo and hair bleach. Shake well.
- Apply the soap cap
Begin with damp hair. If the hair is very long, segment it into three sections. While wearing protective gloves, use the color bottle to apply the soap cap evenly on the hair. Work the soap cap through the hair.
- Process the soap cap
The exact processing time depends on the color of the permanent dye in the hair. Process for 10 minutes, then check a strand to see if the hair is lightened to the desired level. Keep processing, checking every five minutes, until the permanent dye is removed.
- Shampoo out the soap cap
Wet the hair again, and lather the soap cap. Rinse until the water runs clear. Condition as usual.
- Tone the hair
After conditioning, towel dry the hair. Check the color. Red and orange tones are common when bleaching permanent color out of the hair. For red tones, mix a pea-sized amount of green food coloring with shampoo. For orange tones, use blue. Apply the toning shampoo, and leave it on for 10 minutes. Rinse until the water runs clear.
- Re-color the hair
Toning may be enough. However, for more even hair color, apply a permanent hair color at the target shade. Mix and process according to manufacturer's instructions.