A video from what appears to be Mongolia, a former Soviet satellite state, shows election fraud via the disappearing ink of the pens provided in the voting booths.
I searched the Internet and found a webpage touting Frixion erasable pens, the ink of which can be disappeared when heated. The pens come in gel, marker, and highlighter versions with various colors. The webpage says the pens “are easy to come by at your local office and grocery stores, and are as cheap as $2 a pen.”
Solution: Bring your own pen to the voting booth!