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Siren's Song is a blue-green tint that glows under black light. For best results, we recommend applying to hair that has been previously lightened to the lightest level 10 blonde. Blendable Colors and Shades All Manic Panic hair colors are safe to mix to create custom shades, making the shade possibilities endless! Combine any formula with the maniac/pastel-izer mixer to create soft, on-trend pastel shades. Ready to use, no developer required. Semi-permanent hair dye This semi-permanent hair dye formula gradually fades in 4-6 weeks because it does not penetrate the hair cortex, but simply rests on the hair shaft. Cruelty-Free Vegan Formula This cream hair dye contains vegan ingredients proven on celebrities, not animals. Made in the USA. The hair color is PPD and ammonia free, paraben free, gluten free, resorcinol free, and phthalate free. Additional Features Benefits of Hair Conditioning, Resealable Tub for Longer Use, Comes with Instructions