GUILT-FREE GLAMOUR!® Voodoo Blue is a dark cyan dye with green-ish undertones. Voodoo Blue can give hints of teal to virgin, unbleached hair. For the most vibrant results, we recommend lightening hair to a very light level 9 blonde and toning hair to prevent unwanted tones. Details: Style: Classic Semi-Permanent Hair Dye Color: Voodoo Blue Color Description - Dark Cyan Blue Hair Dye Volume: 4oz / 118ml Ingredients: Vegan Friendly, PPD Free! Additional Features: Benefits of Conditioning Hair, Resealable Tub For Longer Use, Comes With Instructions Duration: 4 - 6 weeks For Best Results: See Instructions Tab Tested on celebrities, not animals™.