Everything you need to know about making Riso prints.
Riso printing is a stencil printing method similar to silkscreen that was originally created for use in offices and schools for high quantity duplication. These machines were never intended to print artwork but have been repurposed by artists due to their their affordability and unique look. Like silkscreen, Riso uses spot color inks and is not limited to a CMYK color space.
How it works
A digital color separation is sent to the Riso, and burned into a stencil called a "master." The master is wrapped around one of the color drums and then flooded with ink. Paper is pulled into the machine, and forced between the drum and a pressure roller, forcing ink onto the page. Each color layer is printed one at a time.
Spot Color Inks
We currently stock 12 ink colors:
Black, Orchid, Blue, Aqua, Kelly Green, Green, Yellow, Sunflower, Orange, Red, Bubble Gum, Fluorescent Pink
At the bottom of the page there are links to download Adobe libraries of swatches to use while designing your artwork.
We print almost exclusively on 11x17" paper stock, and use other standard sizes for some projects. The Riso cannot print full bleed, the maximum printable area is 10.5x16.5. We offer in house trimming for projects requiring full bleed or a custom size. We only print on uncoated paper, Riso ink dries by absorption.
For white paper consider:
French Pop Tone, Construction, Smart White Mohawk Via Vellum, Via Smooth Mohawk Opaque Cougar White or Natural Neenah Exact Vellum Bristol
For colored paper consider:
French Pop Tone Domtar Earthchoice Colors Neenah Astrobrights
We understand not everyone is a paper nerd, if you need help picking out a stock for your project we are happy to make suggestions!
It usually takes 2-4 business days for us to receive paper orders.
There are two methods of setting up files for the Riso
2. Grayscale copy
Working with spot color channels is the best way to set up your files so you can see the results in color while the separations will automatically be in grayscale. You can easily convert your existing artwork to channels. The Riso will apply a graintouch or halftone screen to produce tints of a spot color, there is no need to bitmap files prior to printing. For information on setting tints of Pantone colors please refer to this link.
For creating a grayscale version:
If you’d like 100% density please set your object in pure black (#000000). To produce tints we suggest setting artwork at varying shades of gray by changing the brightness percentage in the color picker. First set the color picker to pure black, then enter percentages in the brightness field. Changing all objects of a certain color can be easily done by using the recolor artwork tool in Illustrator. For example, if you’d like all pink objects to print at a 80% density, you’d set the color picker at pure black, and then set the brightness at 20%.It is best to avoid setting tints by using opacity or in shades of K.
We ask that larger dark areas of solid color do not exceed 80%, this can lead to uneven coverage and make the prints messier. Often using 100% black is not visibly different from 90% and ends up being extra ink on the page. To create a noticeable variation in tone we suggest separating them by 15-20% The ideal range to stay in is 20-90%, anything above 90% is not visibly darker and anything below 20% is generally too light for the Riso to print.
For faux-cmyk printing we either use:
Aqua, Flo Pink, Yellow, Black
Aqua, Red, Yellow, Black
Yellow, Flo Pink, Blue
Yellow, Red, Blue
For some 2d artworks such as paintings we can use images or scans to create separations. We have profiles from ColorLibrary.CH which we use to create separations, which we will do for a small fee. If you’re interested in using any of their other riso profiles let us know and we can work something out.
Please set all type in Illustrator or InDesign if possible. Text should be set in pure black (#000000) and MUST be outlined. Do not flatten text and line art, Text can be set at a tint however that requires it to to be rasterized which can cause it to be less crisp.
No Transparency! Please include a white background in all documents you send us, but do not flatten files, especially files containing text. PDFs automatically export with transparency in Illustrator unless you add a background.
The Riso will not print vector objects in graintouch, only with a halftone screen. If you’d like vector objects to be printed with graintouch they must be rasterized at 300-600 ppi.
Please set up your artwork at final trim size, unless printing with bleed. We suggest using a .125” bleed. If making an 8x10” print with bleed the files you send should be 8.25x10.25”. If making an 8x10” print without bleed the files you send should be 8x10”. If possible we will double up prints on a single 11x17 sheet to be as cost effective as possible.
Please do not include crop marks or registration marks, we prefer to set that up ourselves.
When printing zines or books, export as pages not spreads, you should also include a full color pdf of the final project set up as spreads for reference.
If you’re sending us grayscale pdfs please be sure they are exported as compatible with Acrobat 5.0 and change all compression to .ZIP compression. Do not include profiles.
As you may already know, Riso printing is not perfect, we do our best to mitigate these issues but they will still occur to some extent. mis-registration roller marks wet ink offset smudging uneven coverage The ink never fully dries in most cases and heavy areas of coverage can smudge if not handled carefully.
(use this when working in channels)
Please let us know if you have any questions regarding file setup, we do not charge a fee for file revisions (many printers do) so we ask that you carefully review your files before sending them.