I used it as at my step-father's house while showering there, and became interested in the product (but no noticeable results after that one use). I used it every day for 5-6 days, and my mostly salt with pepper hair went back to salt and pepper. It was gradual enough that my family (wife/kids) didn't notice this gradual change in darkness. I finally fessed up to my family, and they realized the change. My hair was previously black, and it has darkened mostly to my natural hair color, perhaps a bit more dark brown. The top of my head in particular darkened up, with the sides still having enough "salt" that it looks very natural. I've stopped after about 8-9 applications, as I want a still more natural salt and pepper - and have just changed the salt to more pepper.
Two issues: Firstly, I did notice a slight change in hue of my white hair. Due to the contrast in my black hair, the white was always very brilliant looking. It now looks more dull, or perhaps a slight blue hue that I've seen on other reviews. Definitely not a blue hair though. Also, when I was using it intensively for 5-6 days straight, it made my head itchy, so I stopped for a few days. Then I proceeded for 2-3 more treatments, and that kept my head at a more natural and gradual dye job.
I'm waiting to meet up with a close buddy I haven't seen in about a month to see if he will notice...Very natural and gradual, well within your control to see how dark you can go. My wife (who loves my white hair) has encouraged me to keep going!
Bottom Line: Yes, I would recommend this to a friend
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