Tags: Colour.
Rich black in printing is an ink mixture of solid black over one or more of the other CMYK colors resulting in a darker tone than black ink alone generates in a printing process.A typical rich black mixture might be 100% black 50% of each of the other three inks. Other percentages are used to achieve specific results for example 100% black with 70% cyan (C) 35% magenta (M) and 40% yellow (Y) is used to achieve cool black. Warm Black is 35%C 60%M 60%Y and 100%K.