PRINTING MULTIPLE colours
The layering of colour is something the Risograph does very well. Taking your print from a single colour to a double or triple can introduce a vibrancy and playfulness to your artwork. When adding a second colour its possible to layer inks on top of one another at differing densities to produce an additional blended colour.
The Risograph we work with is an RP3700 which only has the ability to print one colour at a time. To print artworks with multiple colours, the artwork must be run through the machine multiple times. There are a few things to keep in mind when setting up your artwork to reduce printer marks and errors.
Try to avoid heavy ink coverage on multi-coloured prints, particularly at the paper feeding edge. The Riso feeds paper through with a set of rubber rollers and heavy inking will leave track marks on your prints.
When printing double sided, it is difficult to back up artworks perfectly. When designing try to keep to light ink coverage on one side as the internal pressure rollers can leave drag marks on your prints.
When printing multiple colour prints misregistration can occur, it’s never more than a few millimetres but something to consider when reviewing your artwork. Increasing the borders on your graphics will help layers overlap and ensure full colour fill. This is called trapping.