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Lots of manufacturers offer a rainbow of ink colors. People can even go online and order a bottle. The Food and Drug Administration has not regulated the pigments in tattoo inks so far, but agency officials will investigate and recall tattoo inks if they hear of a specific safety concern, like bacterial contamination that could lead to infections. Joel Saget/AFP via Getty Images hide caption

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Joel Saget/AFP via Getty Images

What's In Tattoo Ink? Why Scientists Want To Know

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The EPA says it aims to eliminate the testing of chemicals and pesticides in animals by 2035. filo/Getty Images hide caption

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EPA Chief Pledges To Severely Cut Back On Animal Testing Of Chemicals

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THC, a key psychoactive ingredient in marijuana, is toxic to dogs, veterinarians warn. So keeping dogs away from discarded joints, edible marijuana or drug-tainted poop is important. Hillary Kladke/Getty Images hide caption

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Hillary Kladke/Getty Images

Legal Weed Is A Danger To Dogs. Here's How To Know If Your Pup Got Into Pot

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