Hi guys! I once saw a plastic sheet with milky color. When coveredagainst a dark background plate, one can write on it with an ink-lesspen. But when the pastic is taken off the background plate, the handwritingdisappears. Do you know what it is and where I can buy it?
the front sheet is an opaque pvc over a dark blue card with blue wax over it. when you write on the pvc it presses the pvc onto the wax and the text appears, pulling the pvc away from the wax removes the image and resets the tablet.
