The pens, which cost around £5, carry an “erasable ink” logo and the Japanese stationery company that makes them promotes them as “ideal for those learning to write with ink because if you ...

The erasable pens I remember using when I was in high school in the late 2000s were laughably bad. They required a lot of pressure to transfer ink to paper, and even then, the ink came out faded ...

Unlike erasable pens of the past that, like tattoo removal, never seemed to make ink completely disappear, FriXion Ball uses a heat-sensitive ink that rubs away without a trace.

That is what makes this newer kind of erasable ink so cool. The ink pen we're using here, manufactured by Pilot, turns transparent after it is heated to 140 degrees or greater.