I love henna too. I usually add a couple of tablespoons of ACV to it to help it hold onto the greys. It's like a recipe, EVOO, ACV, crushed rosemary, hot water. I have medium brown hair and left it on for an hour last time, it's now like a burgundy, but not really bright or dark, it's still subtle enough to pass for natural color. And the way it looks in the sunlight is amazing! I'll upload a picture of my henna'd hair on my profile if you wanna see.<br><br>
It usually lasts about 4 weeks or so before I start to see my greys again, and the great thing is, that you don't really have a defined root line like with chemical dyes. At least not in my experience.<br><br>
A good henna will also be a very fine powder without sticks and other large plant pieces in it. And as others said, beware the "black henna". You want 100% pure henna, nothing added. Be sure that when you rinse, you rinse a really long time. A really long time. The olive oil does help to make rinsing easier, but it's still gonna take a lot to get that stuff out.<br><br>
I put plastic wrap on my head and wear either a black stocking cap over that or an old towel because the heat is important in getting the color to release from the plant and attach to your hair.<br><br>
Anyway, go for it. It's super good for your hair, and you don't have to worry about roots or yucky chemicals. And it's much less expensive than a salon visit. What's not to like? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/winky.gif" style="border:0px solid;" title="Wink">