Since the 1970s, tattooing has grown into a $2 billion industry in the U.S; at the DC Tattoo Expo in January, Angela Diorio, left, of McLean, Va shows off
Since the 1970s, tattooing has grown into a $2 billion industry in the U.S; at the DC Tattoo Expo in January, Angela Diorio, left, of McLean, Va shows off her back tattoo; Amber Rose of Raleigh, N.C. also poses at the Expo. (By Jonathan Newton)