> If the chemical they use can be located and obtained cheaply, perhaps
> this would even eliminate the need to peel the paper away and risk
> pulling off any traces.
It appears that the chemical which destroys the plant fibers is
sulphuric acid. In the case of the product I mentioned above, the
sulphuric acid is produced by applying wet sodium bisulfate to the
surface, allowing to dry, then heating with an iron, which generates
some sulphuric acid within the material. After that, the residue can
be washed away. How well this would work on top of a meltable toner
substrate I don't know. A person could always just use some sulphuric
acid to dissolve the paper, though the sodium bisulfate seems to be
much more attractive from a safety perspective. There is also the
possibility that a lot of sulphuric acid will also get rid of the
toner too.