Vibrant semi-permanent hair colour Manic Panic High Voltage Voodoo Forest hair colour produces wonderful effects on both dark and pre-lightened hair. With this semi-permanent hair colour you can create trend-setting styles with exceptional shine and luminosity. Gentle formula The gentle, nourishing formula conditions the hair as it colours, creating sleek, radiant results after application. Free from parabens, PPD and ammonia, this vegan and cruelty-free hair colour is kind and gentle. Long lasting results Manic Panic High Voltage offers 4 to 6 weeks of bold, vibrant colour. For best results when colouring darker hair, ensure the hair is pre-lightened for intense, long lasting colour.