We all remember erasable ballpoint pens from our school days. The ink was barely usable and the eraser tore through the page. Luckily those days are long gone. New ink technology has made the erasable pen hip again with a wide range of uses from the classroom to the boardroom.
The Pilot FriXion is the leader of the pack when it comes to the erasable ink market. Using a special thermo-sensitive ink the FriXion erases by - you guessed it - friction. The eraser itself is a special rubber tip that leaves no additional residue. Looking at the vibrant colors on the page you would never know the ink is erasable.
Gel pens are not the only domain where you will find erasable ink. The Uni-ball Propus Highlighter appears to be a standard marker but contains erasable fluorescent ink. The plastic eraser is specially designed to minimize wear and tear on the page.