The use of Natural Indigo Powder (the leaf of Indigofera tinctoria, or what is commonly called true indigo) is among the safest ways to achieve healthy, dark brown/black colored hair without the use of synthetic and/or harsh chemicals. The use of Indigoferrin (pure crystalline indigo) has been widely documented for its ability to restore the texture of your hair while giving your hair an all-natural color and sheen at the same time.
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