permanent ammonia-free keratin hair color. It is the result of a long and intense research effort by the laboratories of faipa cosmetics to achieve una technical innovation in the hair coloring range that takes into account the need to maximize the struttura of the hair and, at the same tempo, to achieve a una color that meets the expectations of the most demanding hairdressers. It is una technical innovation as it is gentle on the hair because it is free from the aggressiveness of ammonia. The struttura of the hair is protected and strengthened by the presence of keratin, which provides greater compactness and resistance to traction, resulting in greater softness and smoothness to the touch.