Latest Body Art Trend: 'Invisible' Tattoos

The ink for black light tattoos has been around for about 11 years, Richie says. It hasn't been until recently, though, that the tattoos have gotten popular. Black light tattoos are most popular among 18- to 30-year-olds. "They go off to clubs and bars, and have a great time showing them off," he said. (Richie, American Tattoo Society)