Tattoo ink may contain toxic cancer-causing chemicals, a new study finds.Scientists at State University of New York (SUNY) found that nearly half of a 56-sample of tattoo inks they investigated had azo-compounds, which degenerate under ultra-violet light — emitted in sunlight — into cancer-causing chemicals. Many also contained particles below 100 nanometers (nm) in size, which they said could get into a cell's nucleus and trigger cancerous mutations.
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