here's the info on "black" henna, from The Henna Page's website, one of the best sites around for info on mehndi (the decorative application of henna designs)
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Para-phenylendiamine based black hair dye should never be put straight on your skin, plain, or mixed with other material. Synthetic Black Hair Dye is illegal to put on skin, because that is not an approved use. Even when this dye is applied to hair, people must wear gloves, and they try to not get it on the scalp! PPD, Para-phenylendiamine can seriously injure people. Para-phenylenediamine is a strong sensitizer, transdermal toxin and potential carcinogen. Many people get itching, blistering and hair loss from using black hair dye on their hair.
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