Abstract: A method and apparatus for placing identifying information on video cassettes, computer floppy disks, containers, file folders, and the like, whereby the identifying information is erasable. The apparatus comprises a kit with vinyl coated labels and a marking pen containing water soluble ink. When applied to the labels, the ink is smear-resistant, smudge-resistant, and highly resistant to erasure under normal handling. The ink is removed from the label by wiping the label with a damp cloth or similar material, thereby making the label reusable.