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Three in 10 people in America have a tattoo, and those in the 18 - 34 age bracket, it's almost 40 percent. But what's in those inks, exactly? NPR science correspondent Nell Greenfieldboyce talks about what researchers currently know about tattoo inks. It's not a lot, and researchers are trying to find out more. Email the show at [email protected] more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy
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