I am extremely chemically sensitive, especially to fragrances. For 2 years I was using a well-known fragrance-free hair color, which has a high percentage of ethanolamine, which I discovered was causing hair loss. I stopped using that product and let my mostly gray/white hair grow out for 3 months, and the hair loss stopped. I do not feel my best with gray/white hair, not because of an age issue, but because of color theory, i.e., some people do not have the skin tone for light hair, so I began a search for a new hair color. Many so-called experts claim that Elumen is a non-toxic hair color, but I tried a strand test with it, and the scent made me ill, and it is very staining on hair, skin, everything. Henna also is a staining commitment and a lot of work, though natural. My last hope was here, ONC, so I tried a strand test first, which worked well to cover gray/white, and the banana oil scent did not make me ill. I first tried 6N with 7N, which was too dark. The next month I tried 7N with 8N, which was too light and did not cover gray/white. The magic combination, which is not listed in the recommended combinations on this web site, is 6N with 8N, which has given me the perfect shade of warm brown, not too dark, not too light. Best of all, the percentage of ethanolamine is low, and indeed, after 3 months I have no hair loss. In fact, my hair is really thick and beautiful now. It is very important to follow the instructions, particularly with the application timing and the heat timing and the 3-minute massage before rinsing. The conditioner is also important; however, the conditioner that comes with the kit made me ill because of its fragrance, so I can only use a separate fragrance-free conditioner, but it is an important final step. For me the color holds well and fades subtly, yet it does not have the feeling of a BIG commitment, which can only be cut out to change. While there is no such thing as 100 percent chemical-free hair color that can really cover gray/white, this is the closest to BEST that I have found in a home coloring kit, and believe me, I have searched. The process takes about an hour to an hour and a half, not including washing and drying hair before starting, so at $60.00 and an hour or so, that is far less time and money than a salon, but of course, not as cheap or easy as drugstore dye or going gray. For me, right now, it is worth it. For reference, I am 55 at the time of this review, with a chin-length bob, which I cut myself. I strive to live a healthy, low-chemical lifestyle. I can only hope that this hair color once every 4-6 weeks will not compromise my health, but in any case, it sure makes me happy to have found it!