It is the finest, most versatile hair color in the professional industry with a low-level ammonia formula that preserves the integrity of the hair and provide unmatched shine, silkiness and long-lasting color. Paraben-free. High-level dye load provides superior coverage of gray and allows for vibrant, rich, long-lasting color. Fiber and help color adhere to the hair. Keratin amino acids strengthen hair. Silk amino acids act as a color carrier to help drive color deep into hair.