Henna does not come in different colours. It's a plant with 1 dye molecule that stains the skin 1 colour. The range of colour from orange-reddish brown to dark cherry depends on skin thickness, oxidation, temperature and body chemistry.
Fake ‘Black Henna’ is concentrated para-phenylendiamine (PPD) based hair dye. This is illegal to use on the skin in Canada because of its severe toxicity: it is known to cause tumors, organ failure, permanent scaring, muscle deterioration, etc... PPD has a delayed symptomatic reaction of 3–10 days; feeling ok while the 'tattoo' is on doesn't mean it's safe.
How to tell if it’s PPD and to report vendors using or selling it read more...
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