Risograph printing is like screen printing but done on a machine. The Riso prints one ink colour at a time using a stencil applied to a rotating drum. By feeding pages through two, three or four times and changing the drum stencil, you can produce gorgeous multi-layered artwork. The Risograph was invented by the Riso Kagaku Corporation in Japan in the 1980s as a low-cost alternative to traditional litho printing, but is now used by artists to create unique artworks.