I'm blonde so I have really light lashes, this made them very dark and works in 15 minutes. It's a great product! The longest lasting eyelash dye I've ever had, it lasts about 4 to 4 1/2 weeks. I recommend it to everyone, even those who have dark lashes, it will make a difference.
If it gets in your eyes it will sting a little bit but just be sure to keep them shut the full 15 minutes it is on.