The darker something is in your file, the more ink the Riso will put down.
The same principle works for every ink colour. This is useful for creating shades and variation from a single ink colour. You don't necessarily need another ink just because you want a lighter version of a colour.
Digital ArtworkRisograph Gold Artist: Will Harvey Printed by: Dizzy Ink Greyscale 100%-10%Single_Colour_BlackSingle_Colour_GreenWhen designing your artwork, make the most out of this density feature!
Add depth, shading & highlights.
Use solid greyscale values rather than transparency.