Choose the color based on the document cover, brand standards, and how formal the finished piece needs to look. The verified options include black, white, silver, navy, blue, red, and gold. Black and silver are safe choices for reports, manuals, proposals, and catalogs because they work with many cover colors. White can look clean with white or light covers. Gold, navy, blue, or red can support branded presentations or department-coded documents. If the wire will be visible on a shelf or handed to clients, match it with the cover rather than treating it as a small detail. Strong color contrast can work, but only when intentional.