RISO printing can indeed be messy if proper operational precautions are not observed, primarily due to the unique nature of its soy- and rice oil-based inks. Because the ink is pushed through a master stencil onto paper via a rotating drum, it relies on absorption into uncoated paper stock rather than heat-setting. If prints are handled immediately before the ink fully dries, or if high ink density is applied, smudging can easily occur. Additionally, changing color drums or maintaining the machine requires care to avoid getting ink on hands or workspace surfaces, though routine operation is clean when standard user protocols are followed.