A new study has researchers calling for closer regulation of tattoo ink.

Researchers in Arizona analyzed the chemical composition of 17 different tattoo inks from 5 different manufacturers. They found the ink ingredients vary from manufacturer to manufacturer and from color to color.

The researchers said the Food and Drug Administration, which leaves tattoo regulation up to local and state officials, should get involved to help protect against potential tattoo side effects.

The study also found a suggestion that some of the inks may contain metals, but noted more research is needed to confirm the information.

Stay with TheWBALChannel.com and 11 News for the latest news updates.