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National Gypsum plant, Mount Holly, North Carolina. This is gypsum slurry being drawn off the conveyor belt to test for qaulity control. This product was made with flue gas desulferized gypsum, or FGD gypsum, a form of coal ash produced by the scrubbing process that removes sulfer dioxide from the emissions of coal-fired power plants. National Gypsum is based in Charlotte, NC
