Humans have been making use of Mother Nature and all her natural secrets for thousands of years, from the air we breathe to the nutrients we gain from the foods she provides. One such natural gem is different plants and their ability to dye our hair and skin. Two such plant dyes, and the most well-known ones, are indigo (Indigofera tinctoria) and henna (Lawsonia inermis), which are still used today as effective hair dyes and conditioners. And as only Mother Nature can provide, it…