I LOVE HENNA.
I learned all about it from hennaforhair.com. A really informative website! READ IT!
Here are some pictures:
BEFORE:
AFTER HENNA #1:
AFTER HENNA #2:
AFTER HENNA #2, FULLY OXIDIZED:
As you can see, the color IMMEDIATELY after a henna is dramatic, but after a few days it oxidizes into a much richer, darker color. Sunlight also has a huge impact on how it looks -- obviously much redder in direct sunlight, and darker in a dorm room at nighttime.
I love it. It's also vastly improved the strength and resilience in my hair.
If anyone is wondering, I use 100g Jamila BAQ henna mixed with tap water, nothing else. None of those fancy mixtures for me.
WARNING: If you use anything that does NOT say "BAQ (Body Art Quality)" henna, you run the risk of putting an unknown quantity of unknown chemicals in your hair. BE WARNED that if you have a preexisting dye job, these chemicals can turn your hair GREEN or PURPLE.
And, a gratuitous work-in-process picture: