The term henna tattoo is inaccurate, because tattoos are defined as permanent surgical insertion of pigments underneath the skin, as opposed to pigments resting on the surface. Likely due to the desire for a "tattoo-black" appearance, many people have started adding the synthetic dye PPD to henna to give it a black color. PPD is extremely harmful to the skin and can cause severe allergic reactions resulting in permanent injury or death.
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