Risograph style

Every feature of the look is a consequence of how the machine works. A Riso duplicator is a stencil printer: it burns a master for one colour, wraps it round a drum loaded with that ink, and prints the whole run. A second colour means a second drum and a second pass, so the paper goes through the machine once per ink. Nothing lines up perfectly twice, which is why riso work has doubled edges and haloes of bare paper where two layers were supposed to meet. The ink is soy based and never fully dries into the sheet, so it sits on the surface, mottles into visible grain, and rubs off on your hands. Where two inks cross they overprint into a third colour that neither drum contains, and tone inside a single colour is a coarse screen of that one ink rather than a mix, so the palette stays flat and the paper keeps showing through.

The machine was built in Japan in the 1980s as office equipment, sold to schools, churches, and community groups that needed a thousand newsletters cheaply and did not care that the result looked rough. Artists found it in the 2000s and adopted it wholesale, because it makes short runs affordable and because its inks include colours offset printing cannot reach: fluorescent pink is the signature, a genuinely fluorescent pigment with no equivalent in a four colour process build. Zines, risograph studios, and small press comics carried the look far enough that it now reads as a signal on its own. Riso means independent, made in small numbers, and made by someone who chose the constraint.

It is worth separating from its two technique relatives on this site. Halftone is the screen itself, dot size carrying tone in a single ink, and riso uses it inside each layer. Duotone is a photograph mapped into two colours, an image processing operation that can be done perfectly. Riso is the printing process whose imperfections became the style, so the register slip, the grain, and the overprint are not mistakes it tolerates but the entire reason anyone reaches for it.

Faking it on screen is mostly three moves: flat fills in two or three saturated spot colours, layers offset by a couple of pixels rather than aligned, and a multiply blend where they overlap so the crossing area darkens the way wet ink does, all under a fine grain overlay. Two cautions. Misregistration applied to running text or to a control label is simply illegible, so keep the slip on shapes, headlines, and illustration, and leave anything a reader has to read or click in register. And the fluorescent inks are the part the medium cannot deliver: a screen showing sRGB flattens that pink into something ordinary, which is why riso work usually looks better in your hands than in a photograph of it.