What it is Bigen Permanent Powder Hair Color is perfect for those looking for long-lasting 100% gray coverage that enhances your natural hair color. Bigen permanent hair color is ammonia-free and requires no hydrogen peroxide. What it does The Bigen Permanent Powder Hair Color uses a unique powder formula that is activated by water. This naturally opens your hair s cuticle to infuse rich natural color into even the most stubborn gray hair. What else you need to know? This deposit only hair color is a gentle choice and has been proven for over thirty years. And with no hydrogen peroxide or ammonia required this hair color provides optimum darkening and creates optimum sheen regardless of your natural consistency hair color length condition or style!