Nothing wrong with a tiny bit of vanity... just so long as it doesn't make you sick! Or ruin your hair either, in this case. Fortunately, people have been dyeing their hair for centuries before commercial chemical hair treatments came along with their harsh chemicals.
Natural hair coloring recipes are definitely available to give you the hair color you want without the health risks. Henna, for one, is a very popular natural hair color option with lots of variations possible by adding this or that natural ingredient to your hair coloring mix.
