A friend of mine had an incident with these pens in high school. Used one on his...

TheKnack · on March 9, 2022

If you put the paper in the freezer, the ink will reappear.

The ink doesn't really go anywhere, even when you use the "eraser". It just becomes transparent. This can be reversed by exposing it to cold.

Pilot mentions this on their tips and tricks page: https://www.pilot-frixion.uk/uk/tips-and-tricks/

colordrops · on March 10, 2022

But if you erased a lot then the page would be a mess after everything re-appears.

analog31 · on March 10, 2022

Wow, that's just like the secret spy pen from the Johnson Smith catalog. Brings back memories.

dqv · on March 9, 2022

That’s too bad. He could have just put it in the freezer to get the ink back. Uh, but let’s keep that between us.

CamperBob2 · on March 10, 2022

Spoiler: that was the physics test. He failed.