sentences:  Alkyd resin medium for artists was first invented in the 1970s by Arthur DeCosta, a longtime professor at The Pennsylvania Academy of the Fine Arts in Philadelphia.DeCosta's medium, Turco Classic, was sold only locally at the Academy's school store, the Philadelphia Utrecht Linen art supply store, and one or two other privately owned art supply stores.DeCosta believed his medium had similar qualities to Maroger medium (Jacques Maroger), the fast drying, supposed medium of the Old Masters.