Every color that you use on a website has a unique code that a search engine spider can understand.  Avoid using a separate color for a specific sentence or word that you hope a search engine will capture.  For example if the color of the wording on your home page is black but you use red for a phrase your reader may be impressed but not the spider.  This same rules applies to fonts.  It's best to use the same colors and fronts throughout your home page keyword descriptions.