Riso Kagaku Corp is a Japan-based manufacturer of printer-duplicators, printers, and printing products. The firm developed oil-based pigment ink, Orphis Ink, which is used by the firm's printers. The ink has a stable composition and high water resistance, making it suitable for high-speed printing. Riso has three manufacturing facilities in Japan and a worldwide distribution network. More than half of the firm's revenue is generated in Japan, with the rest coming from countries in the Americas, Europe, and Asia.