He said: 'We need to do more work, but there is no question that these substances can be toxic.'
About 20 percent of British adults have a tattoo and last month Public Health England published new guidance on the industry.
It said: 'Some inks are sold with little or no accompanying product data, and their composition may remain uncertain even at the point of use.'
The report found that red colours have been found to contain mercury, while greens and blues have been found to contain cobalt.
A study by Jorgen Serup, Copenhagen's university hospital's professor of dermatology, found carcinogenic chemicals in 13 of 21 commonly used European tattoo inks.
He told paper: 'Millions of Europeans are now being tattooed with chemical substances of unknown origin.'
Professor Serup wants people to be given written information about the risks of tattoos and wants further research into the potential dangers.
Two years ago the U.S. Food and Drug Administration launched an investigation after research found inks contained potentially dangerous substances including metals and hyrocarbons that are known carcinogens.
One chemical commonly used to make black tattoo ink called benzo(a)pyrene is known to be a potent carcinogen that causes skin cancer in animal tests.
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