When you get a tattoo, do you know what you're putting under your skin? According to new Binghamton University research, the ingredient labels on tattoo ink don't match the actual substances in the bottle. The researchers analyzed tattoo inks from nine manufacturers in the United States and compared their actual contents with the label. The manufacturers ran the gamut from major, global companies to smaller producers; the inks in question came in six colors. Of the 54 inks, 45 of them—