Risograph is a brand of digital duplicators manufactured by the Riso Kagaku Corporation, that are designed mainly for high-volume photocopying and printing. It was released in Japan in 1980.
Risograph printing is a technique best described as a ‘digital screen printing’. The process is similar to screen printing, but with the convenience of an office copier. It’s known for its vivid colours (that other printers can’t produce) and its specific textures.