FAIRFIELD, OH — Johnson Matthey Pigments & Dispersions has acquired the cadmium pigments product line of Engelhard Corp. in a move that Johnson Matthey said boosts its position as the world’s biggest supplier of cadmium pigments. Johnson Matthey Pigments & Dispersions produces a range of cadmium, complex inorganic and transparent iron oxide pigments and dispersions for coatings, plastics, construction materials, and graphic arts.