An employee uses a magnifying glass to check samples of M&M's candies at the production line of candy and chocolate maker Mars Chocolate France's plant in Haguenau, eastern France, December 13, 2011. Mars will invest 45 million euros ($59 million) during the next 18 months in its Haguenau plant to increase the production of M&M's candies by 20 percent. REUTERS/Vincent Kessler (FRANCE - Tags: FOOD BUSINESS)