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I believe that using Frixion[1] pens you can erase the ink (more precisely, it becomes transparent) by applying heat to it. This is usually done by rubbing the written area with the "eraser" at the top of the pen, but I think you can do a bulk erase (before reselling/donating the book, for example) by placing it in a microwave oven.

Anyone has done this/can provide feedback?

[1] https://www.nippon.com/en/features/c00520/

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I love Frixion pens and use them every day when writing notes, and annotating drafts. They're also great for writing under a document camera when teaching. Although I wish there was an intermediate thickness between the thin ball-points and the really fat felt-tips.

That said, I wouldn't use Frixion pens to write in books that I wasn't prepared to write in using normal pens. The ink doesn't completely disappear. The color also comes back (to some extent) if you put the paper in a freezer.

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