Whenever you are designing brochures, magazines, flyers, etc. you should take into account how to use black to ensure your text and pages print the way you want it to print.
Text should always be created with plain black which is 100% black ink. This is important to remember. This ensures that only the text will print on one and only one plate for the black ink in the printing process. Using 100% black gives the design a crisp, sharp text print effect whether or not you use a serif or sans serif font. When using four color black for text, the plates could possibly shift, causing this to slightly misalign thus creating fuzzy text.
Using this black really adds punch to your design. This black is made up of Cyan at 62%, Magenta at 52%, Yellow at 51% and Black at 98%. This mixture of CMYK increases the ink density on the page verses using a 100% black. Use this rich black for backgrounds or silhouettes.