Sydney, Sept 21: One in four Australian adults now have at least one tattoo, but a new Flinders University study has uncovered fresh concerns about what’s really inside the ink.
The research, published this month as the cover story in the Journal of Environmental Health, found that the ingredients listed on tattoo ink labels often do not match the actual contents.
“Using a combination of advanced analytical techniques, we found discrepancies between labelled and actual ingredients in a range of commercially available yellow tattoo inks,” says PhD candidate Ms Batool Aljubran, whose research is supported by the King Faisal University in Saudi Arabia.
“These hidden components raise serious questions about consumer safety, regulation, and the breakdown of pigments in the body.”
Tattoos have surged in popularity worldwide, yet pigments injected into the skin can trigger allergic reactions, inflammation, and even systemic health effects.
The Flinders University team analysed inks marketed as lemon yellow, golden yellow, golden rod and bright orange, containing pigments such as Yellow 14 and 65, Blue 15 and Orange 13. Results showed not only discrepancies with label claims, but also the presence of unlisted elements such as aluminium, sodium and silicon.
Senior author Professor Claire Lenehan, from the College of Sciences and Engineering, says these findings highlight gaps in oversight.
“This study is part of our lab’s ongoing research to investigate the composition, safety, and health implications of tattoo inks,” says Professor Lenehan.
“Our earlier work, led by Dr Tristan Fraser, has shown that carcinogenic compounds and DNA-damaging chemicals can be released during tattooing, ageing, or removal.”
Environmental health researcher Benjamin Boyle adds that tattoo pigments can degrade under sun exposure, ageing, or laser removal, further compounding potential risks.
Together, the body of work aims to inform public health advice, regulatory policy, and safer tattooing and removal practices in Australia and globally.
Despite tattoos becoming increasingly popular, researchers warn that the industry remains underregulated, with few laws or safety standards in place for tattoo and permanent cosmetic formulations.
The study, Decoding Tattoo Inks: Multiple Analysis Techniques Reveal Discrepancies in Ingredient Composition and Elemental Content When Compared Against Label Claims (2025), has been published in the Journal of Environmental Health.
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