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 color range that takes into account the need to maximize the protection of struttura of the hair and, at the same tempo, to achieve una color results that meet the expectations of the most demanding hairstylists. 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 provides greater compactness and tensile strength, translating to a greater softness and smoothness to the touch.