FOR SOLID BLACK TEXT: When you want your text to be solid black, use these percentages: C:0% / M:0% / Y:0% / K:100%.
SOLID BLACK BACKGROUND: When you want an area of solid black within your document, use Rich Black, as represented by C:50% / M:50% / Y:10% / K:100%, because using 100% black (K) only and not a solid saturated black will result in a dull black.
TRUE BLUE: The color blue consists of a color combination of Cyan and Magenta values. The higher the Magenta value, the higher the risk of your blues turning purple. To avoid your blues from turning purple make sure the Magenta value is at least 35% lower that the Cyan value. For example: 100% Cyan and 100% Magenta equals Purple. Although this combination looks blue on your computer screen, it will print purple.
Certain RGB colors when converted to CMYK become dark and dull
