I got the 050 shade since it is for dark brown to soft black hair, and my hair is naturally black. The process was pretty simple; you mix the packets inside and brush into the hair focusing the product on the bottom of the hair. It's basically a bleach so my hair is pretty dry right now.
Here's the result.. ignore the posters and my funky pants. It's a bit brassier than I would like but I'm thinking once it fades a bit or maybe after a couple washes the true colours will show better. It's not bad for an at home ombre style instead of spending hundreds of dollars at the salon!