Permanent hair dye can be faded at a professional salon through use of a bleach bath, with commercially available color removers or at home with one or more homemade concoctions. Homemade solutions include the use of vitamin C and the use of a sulfate-heavy shampoo or dish soap.
To use the vitamin C method of fading hair dye, combine about 1 to 2 grams of vitamin C powder, obtained either as powder or from crushed tablets. Mix the powder with a cheap shampoo and work it through the hair thoroughly. Leave the mixture on the hair for a maximum of 20 minutes.