The point of the colour is not decoration. Coded by digit or letter, a correctly filed run shows an unbroken band across the shelf edge and a misfile stands out from several metres away, which is what makes large filing rooms workable. That only holds if the scheme is documented and applied consistently. Match the label to the folder tab position. See label supplies, Avery lateral filing labels and suspension files.

Colour-coded lateral filing labels displayed beside numbered file folders in a bright, organised office filing system.