[huhtenberg]

That's a very fair warning.

In a similar vein - I had recipes disappear from a notepad because it sat too close to the oven. Also printing on a paper that has something written on it with Frixion with cause these scribbles disappear without a trace.

Extreme temperature sensitivity of Frixion is a very good rake.

[rahimnathwani]

"printing on a paper that has something written on it with Frixion with cause these scribbles disappear without a trace"

Presumably a laser printer, which heats the paper to fix the toner.

Not sure an ink jet or dot matrix printer would do the same :)

[GeckoEidechse]

As others have already mentioned, the process is interestingly enough reversible (to some degree) by simply subjecting it to a colder environment like a freezer for a bit.