Long-Lasting Colour: Achieve a long-lasting, vivid hair transformation for 4-6 weeks with Manic Panic High Voltage Classic Cream semi-permanent hair dye. Conditioning Formula: Get silky smooth, vibrant results with Manic Panic Semi-Permanent Hair Dye. This vegan and cruelty-free Classic Cream formula is hydrating and free from harsh chemicals such as ammonia, peroxide, resorcinol, phthalates, or allergens like PPDs and gluten. Customisable Colour: All Manic Panic hair colours are safe to mix to create custom shades, making the possibilities endless! Combine any formula with the manic mixer/pastel-izer to create soft, on-trend pastel hues. Ready to use, no developer required. Patch Test: Always perform a patch test 24-48 hours before use, following instructions on the packaging.