Shocking Blue Hair Colour: This bold, bright blue colour is perfect for those who want an intense and eye-catching shade. This high-pigment semi permanent hair dye delivers vibrant, long-lasting colour that lasts 4-6 weeks, making it perfect for DIY transformations and salon applications. Customizable and Mixable Formula: Create unique, personalized shades by mixing with other MANIC PANIC colours or our Pastel-izer to create soft trendy pastel hues. High Voltage is the perfect semi permanent hair colour for women and men who want to dye hair without using developer. Best Results on Pre-Lightened Hair - This temporary hair colour works best to colour hair that is a pre-lightened level 9 or 10 blonde. Use our Flash Lightning Bleach Kit to lighten hair before dyeing for best results. It can also be used as a hair dye for dark hair to achieve deeper shades. Conditioning and Resealable Formula - This semi-permanent hair colour is formulated with nourishing ingredients to deeply condition hair, leaving it soft, hydrated, and smooth. The resealable tub allows for multiple uses. The Manic Manifesto - Manic Panic's hair colouring products are always Cruelty Free and Vegan - tested on celebrities, not animals! This vegan hair colour is also ammonia and PPD-free, gluten-free, phthalate-free, and PETA accredited.