Caligo Safe Wash Relief Ink primary colours can be used in several ways‚ for example: 1. Mix the three process colours in varying proportions to create a spectrum of bright colour mixes of your own. You will find you can make a much wider range of greens‚ purples‚ blues‚ reds and oranges than you can achieve with a standard blue‚ red and yellow ink. Use white and black and extender to make an even wider range of tints and shades. 2. Over-printing layers of these inks to create new colours where the transparent coloured layers overlap. 3. For printmakers who need a four colour process set (CMYK) to create prints with multiple plates. (Depending on ink film thickness‚ you can adjust strength with extender as required)