NPR wants to know what exactly is in tattoo ink.
Three in 10 people in America have a tattoo, and for 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.
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