permanent ammonia-free keratin hair color. It is the result of a long and intense research effort by the faipa cosmetics laboratories 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 since it is free from the aggressiveness of ammonia. The struttura of the hair is protected and strengthened by the presence of keratin, which gives greater compactness and resistance to traction, resulting in greater softness and smoothness to the touch.