Cognis Corporation’s graphic arts business announced that it will increase the price of its Photomer energy curing products. To help minimize the impact on customers, Cognis is announcing the increase in two stages for both list and off-list prices effective Aug. 15 or as allowed by contracts.      On Aug. 15, Photomer ECX series and Photonol products will increase 9 percent. Photomer 4006, 4017 and 4061 will increase 15 percent, as will Photomer 3000 series epoxies and blends, excluding Photo...