GUILT-FREE GLAMOUR!® Rockabilly Blue is one of our strongest true, neutral blue hair dyes. This vibrant, ultra-powerful blue leaves cool tones on virgin, unbleached hair. For head turning results, we recommend lightening hair to a light level 9 blonde and toning hair before use to prevent unwanted hues. Also available in our Classic High Voltage Cream Formula! WEAR IT LOUD!® Details: Style: Amplified Semi-Permanent Hair Dye Color: Rockabilly Blue Color Description -  Strong True 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: up to 6-8 weeks with proper hair care For Best Results: See Instructions Tab  Tested on celebrities, not animals™.