mymy: Henna doesn't really dye the hair red, but rather gives it red highlights, relaxes the hair and makes it silky. Body art quality henna will rinse out of locks, braids, and curls, and can be used over relaxed hair.
http://www.nappturality.com/forum/sh...1492392&page=2 <-- Link to post.

I pulled up this quote from a 2007 post about Henna. For those who have used henna many times before, what are your hair results? Has henna loosened your curl?

I am interested in using henna, bt I'd rather not chance it if my curls will become altered permanently. Thank u for your confirmations in advance.