It's possible, but one thing to keep in mind with herbal dyes is that they have a short life span on that dye. Henna, which is as potent as you can get, is much weaker after a day, and is pretty much dead and won't stain even white cloth by day 3. Something like tumeric probably has a dye life span of a day or two, tops.
If you wanted to try it the best route is to mix it into a smaller bottle of your conditioner before each time you wash. If you dump a bunch of it into a 16oz bottle of conditioner it will probably only work the first time or two, tops.
Bookmarks