I had thought of using the same principle myself but its a little risky. People generally are aware
that they may have made an impression just my pressing hard on any pad I have used. This leads them
to, in my experience to look a few pages under where they wrote. Even if they don't do this, there
is a high chance that they could pop up the page to the impression accidently. It works but i would
go to other methods and pads still. If you are stuck for something to do and don't have much on your
person, it might help to know this, however, and for a reasonably low price.