For the ulitimate dramatic color results when you dye your hair, you have to bleach your hair first. You can get amazing blonde results, too! Best Choice for Pre- Lightening hair before using Special Effects Hair Dye. Can be used to bleach hair that is medium blond or medium brown to make it pale yellow or white. Good for frosting, streaking and tipping on light brown or medium brown hair. For long hair, we recommend you buy 2 kits.