GUILT-FREE GLAMOUR!® Bad Boy Blue is the perfect denim blue hair dye with green and grey undertones. For best results, we recommend lightening hair to a very light level 9 blonde or lighter and toning hair that has yellow tones before use to avoid undesired hues. WEAR IT LOUD!® * Style: Amplified Semi-Permanent Hair Dye * Color: Bad Boy Blue * Color Description -  Denim 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, Longer Lasting Formula with 30% More Pigment * Duration: 4 - 6 weeks * For Best Results: See Instructions Tab  Tested on celebrities, not animals™.