Setting the font color

Changing the font color in MS Word
Font color
Sometimes you will find that changing the color of your font can help get your message across better than plain black text. This is most valuable when presenting text in a way that will attract readers and highlight the importance of certain sections or articles.

It is definitely not needed in all situations - more formal writing should remain black, for example.

Try to avoid alternating colors, for instance, making a patriotic passage in red, white, and blue. This can increase eye strain and has the unwanted effect of punishing your readers, even though you have good intentions.
Stick with softer or darker colors that are easier on the eyes and make text easier to read, not more difficult.

Whatever choices you make, be sure that your colors enhance your writing, not take it over.