We recommend using a mix of 60C,50M,50Y,100K for any content in which a rich black is desired. It's important to note that this is not a precise measurement, only a basic recommendation on what our tests have shown to be the best mix of color for a good black. For a cooler black try 80C, 20M, 20Y, 100K. For a warmer black try 20C, 70M, 70Y, 100K.
Note: We do not recommend using "Registration Black" (100% of all inks) as this most likely will lead to problems when printing the file.
For reverse text on a rich black background the smallest size we recommend is 6pt sans serif, 8pt serif, and 10 pt script.