Return labels do not need to be printed in color. However, they must be printed clearly and be highly legible. It is also important that any barcodes, QR codes or other computerized information are printed with clear lines so that scanners can easily read them.
Custom-printed return address labels are often available in color, but color is not necessary to mail them. The key factor in any address label is its legibility, created by keeping backgrounds light in color with high-contrast text. Before mailing any item, individuals should check that the printing is clear and legible and that the lines of the text do not run together.