There is nothing natural about Black Henna. If it's 'black', it's probably a chemical called PPD (para-phenylenediamine) which is commonly used as a dye to color hair. If this chemical is used on the skin, it may have harmful effects and cause blistering, open sores, scarring, and lifelong health problems.
Natural henna is made from henna powder, which are dried henna leaves. Henna is grown and cultivated in parts of India. The henna powder is green in colour. It is mixed with lemon juice, essential oils like eucalyptus and cajeput, and plain water. This paste is applied on the skin which leaves an orange stain on the skin. This stain develops into a brownish-orange stain and stays on the skin for 5-10 days.
A lot of people seek "dark" stain from henna. There is no guarantee on how the stain turns out to be as it reacts differently to skin types and where it is placed on the body.
Some people have chosen the wrong way of developing an 'instant' and 'dark' stain, so the tattoo looks like a real one. This is where the 'black poison' comes into being.
A henna artist who practices natural artistry will NEVER expose their clients to 'black' or unnatural products that are harmful for the skin.
People should use a lot of precautions while getting henna at local events or while travelling to tourist destinations. Always ask the artist if their henna is natural, but also be the judge yourself.
Natural henna looks greenish/brownish and never black when it is first applied on the skin. If you start to feel weird, then wash the paste off your skin immediately and consult a doctor.
I am a strong promoter of Natural Henna artistry. I mix my paste myself and buy certified and organic henna powder from trusted suppliers.
I am also a member of the Canadian Association of Face and Body Artist and we believe that it is our responsibility to educate our community and spread the word about dreadful effects of being exposed to harsh chemical products like 'black' henna.