I have blonde eyelashes and eyebrows, used this product and love the results.
I put Vaseline on my eyelids and under my eyes first. I also put some above and below my eyebrows.
Applied the tint to upper and lower lashes and eyebrows. Then applied activator to all.
Left on for about five minutes and took of everything with a clean, wet cloth. Rinsed and dried.
It definitely looked good, Lashes were darker and eyebrows too. I did though need to do everything twice to get the results that I wanted. The one thing that I did that made everything a lot easier is, I used a mascara wand that I didn't plan on using for mascara again. Cleaned it several times until it was clean, then used it in the black tint, rinsed it again, thoroughly, then used it for the activator. Everything went on very smoothly and it wasn't messy this way. Lashes are definitely darker. Not thicker of course, as it's only a tint, but I can see a big difference. I hope it lasts at least a month!