Siren’s Song is a blue-green 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. WEAR IT LOUD!® The Amplified formula is a semi-permanent hair colour that has 30% more pigment than our High Voltage® Classic colour! This stronger and longer-lasting formula is available in many of our best selling shades. Manic Panic® Semi-Permanent Hair Colour is ready to use, do not mix with peroxide. Vegan ingredients. PPD and ammonia-free. Tested on celebrities, not animals™ .