Be *very* careful doing this yourself as you could seriously damage your hair depending on what other products you might be using. Also, if you do go to a salon in the future, please, please, please be sure to tell them that you used Henna in your hair (in fact, keep the box and bring it with you if you can).
We have several stylists at our salon that are highly capable coloring black hair, so if you get nervous or have questions, please let us know. You can see some of our work on our online picasa site:
http://picasaweb.google.com/salonkhouriphotos/Rebecca#5275799542330950898
Jennifer Elkhouri
co-owner, Salon Khouri
www.salonkhouri.com