Faced with continued increases in raw materials and operating costs, Sun Chemical has announced North American price increases up to 11 percent for commercial, publication and news inks, effective Oct. 1, 2007.      “We have seen the return of significant cost pressures on raw materials during the last six months,” said Greg Lawson, group president, Sun Chemical. “Notably, colorants have been dramatically impacted by the actions of the Chinese government which include shutting down intermediat...