For those of you who aren't familiar with this natural dye, henna is a kind of plant. Its leaves have been dried, ground, and used as a dye for the skin and hair for thousands of years in India and the Middle East. In its purest form, henna for hair will usually leave a rich, reddish brown color. Henna hair dye or henna hair color penetrates the hair shaft and permanently stains it, but the color can degrade with frequent washing and may need touchups.
Other natural substances that henna hair color can have, or which you can try mixing into your own personal henna mix are cassia tea, coffee, paprika, turmeric, lemon juice, and a lot of others.
ndigo and cassia may be all-natural ingredients, but be careful about "fake" henna products and some of the other additives that some pre-mixed henna hair dyes might have. For example, some products touted as "black henna" might not be from the indigo plant, but can contain a jet black dye called para-phenylenediamine, or PPD.This synthetic substance stains fast and deep, but it can also cause severe allergic reactions that can make a person permanently sensitive to certain dyes and chemicals.
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