Research by the European Chemicals Agency suggests that inks used in tattoos could cause cancer and one colour, red, is particularly toxic. Red ink has been linked to dermatitis, due to its mercury sulphide content, while red, blue, green and purple are thought to be likely to cause granulomas – which appear as bump-like ridges on the skin. There has also been a warning against ‘black’ or ‘neutral’ henna. Unlike authentic henna, which is orange in colour, the substance may contain levels of a chemical dye so powerful and toxic that it is illegal to use it on the skin. Anyone suffering an allergic reaction after being tattooed should contact a doctor as soon as possible.
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