So, @krnel, this is very interesting, and more so because I encountered a gentleman late last year at the San Diego Maker Faire who has been doing this or something very much like it for a long time.

His name is Carl Yee, and he has a patented process for erasable paper. This was of considerable interest to me as an inventor, because I "invented" (in reality, only imagined) this concept back during the 1980s but never pursued actually working towards implementing it.

His website is Blue Planet Ink. I haven't yet done a detailed comparison between his technology and the one you've presented in your article, but there are all the links to enable anyone interested to do so.

Thanks for bringing this forward! 😄😇😄