Art of restoration - BostonHerald.com: “MFA conservators mix traditional methods - swabbing and stitching - with state-of-the-art technology, including lasers designed for eye surgery and tattoo removal. Hatchfield uses a 65-pound laser with a gunlike handpiece - costing in the $200,000 range - to clean an eroded and blackened marble basin that lay for 2,000 years in the volcanic ruins of Rome’s ill-fated Pompeii. “Boston is at the forefront of this technology,” she said. “Harvard has a laser, the Gardner Museum just got a laser and we have a laser. They’re very expensive. We’re proceeding slowly because there’s some question whether or not this procedure causes yellowing.””