Wow! What fun reading this niche interest. The Pilot FriXion sounds fun, for spycraft, or to recreate the Acme disappearing reappearing ink from who framed Roger rabbit.
"If you accidentally make your writing disappear, you may be able to get it to reappear by placing the paper in a freezer that reaches below 14°F (-10°C)."
"If you accidentally make your writing disappear, you may be able to get it to reappear by placing the paper in a freezer that reaches below 14°F (-10°C)."