GUILT-FREE GLAMOUR!® Siren's Song is a neon blue-green hair dye that glows under black light. For best results, we recommend applying to hair that has been pre-lightened to the lightest level 10 blonde. Also available in our Classic High Voltage Cream Formula! WEAR IT LOUD!® * Style: Amplified Semi-Permanent Hair Dye * Color: Siren's Song * Color Description -  Neon Blue Green 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, Glows in the Dark Under Black Light * Duration: 4 - 6 weeks * For Best Results: See Instructions Tab  Tested on celebrities, not animals™.