To ensure the copy within your design is printed sharp and clear, we'd suggest keeping all fonts to a minimum of 12pt or higher where possible. Also, keep in mind fonts that are condensed or use thin strokes should be kept to a minimum of 14pt for best legibility.
This will help minimise any risk of the text 'bleeding', an industry term used when the ink can appear ever so slightly smudged. It's important to remember that when using faint text, it won't print as it appears in a high-resolution magazine, rather, how it would appear if you were to use the printer in your office.
Ensuring that you keep your text above our suggested minimums will help ensure perfect results. Although as a general rule, the bigger and bolder your lettering is, the better it will appear!
Another key consideration to make when using text is the contrast of colour used for the font against the design background. The more contrasting it can be, the clearer the result will appear.