Similar to changing the tonal values of images when preparing them for riso printing (4G, p. 96), it is important to consider the ink coverage when preparing to print large areas of colour. One peculiarity of the risograph is that larger areas of colour on the edge of the print format may prevent the sheets from being adequately transported from the print drum to the paper ejection. Another one is that they have problems drying. This can result in a blotchy print image, which can differ greatly from how the sheet was supposed to look. Hence, it is highly recommended to only create colour areas with a maximum of 85% colour.