Erase and rewrite repeatedly without damaging documents – no wear or tear!. Back then, erasing errors seemed to be more a case of rubbing briskly and removing strategic paper fibers – thus removing the error along with them – rather than actually erasing the ink. These days, friction is still used to remove the ink but in a more aesthetic and far less messy manner. The key? Thermo-sensitive ink which disappears with erasing friction.