... freely,wipe off easilyThe ink of V=CLEAR,takes the lead in adopting the "New Photosensitive Hydrolyze Technology".can be written on any ... ,you just wipe it with water,the writing disappeard at once,it can auto vanished in two days under normal condition.Let ... easy wiping,repeatedly used,and economy.SO let your children in the light-hearted doodling,enjoy the endless fun brought by V-CLEAR.