I was introduced to this hair color by a professional hair dresser. I wanted to get Satin but Satin does not have natural black shade. This works with nano technology, whatever that means ... It also contains Jojoba oil. I absolutely love the performance and quality of this hair color. The shade of black looks natural and it is super shiny. It does not have an offensive smell and wears comfortably. I mix this with Trionics and the condition of my hair is better than when I was not coloring it. The color does not stay on the skin but it lasts and lasts on my hair. No fading whatsoever. Great product. Highly recommended to those with sensitive scalp.