Syoss Color Oleo Intense 210 Brown Black is a permanent hair color with an oil-based formula that is ammonia-free, designed for superior care and long-lasting results with professional gray coverage. This hair color maximizes pigment penetration deep into the hair for a rich, intense shade, while the included hair mask, enriched with Fair-Trade Argan oil, leaves the hair looking silky, shiny, and healthy after coloring. It is suitable for dark blonde to black hair and offers 100 percent gray coverage. For optimal results, apply to dry, unwashed hair and leave on for about 30 minutes, then rinse thoroughly and use the conditioner for added softness. To maintain color intensity, it is recommended to use Syoss Color Shampoo and Conditioner, which protect against fading for up to 12 weeks. This product is ideal for at-home use and provides a gentle coloring experience with intense care. Always perform an allergy test before use and carefully follow the safety instructions. One pack is recommended for short to medium-length hair, while two packs are advisable for medium to long hair.