Manic Panic Semi Permanent Hair Dye 118ml. This formula can be used alone or with or combined with other Manic Panic shades. Can easily achieve a new vibrant colour while keeping your hair in top condition. Has a re-sealable tub so that you can easily freshen up your colour and touch up your roots. Manic Panic hair dyes are a semi-permanent formula that should last in the hair for up to 4-6 weeks. Manic Panic started the vivid hair colour revolution in New York back in 1977. They changed the world with their creative, vibrant and electrifying semi permanent hair colours. This world famous hair colouring brand is used by countless celebrities, models, and celebrity stylists. Using superior ingredients in these high quality rich formulas that are guaranteed Vegan and PPD free. The Cruelty-free colours promise a healthy nourished result.