ThermoSafe™
"Density Change Copy-Void Pantograph"

U.S. Patent 5,636,874

An improved copy/void pantograph which reveals a warning message when a color photocopy is made. Utilizing a temperature sensitive camouflage pattern to conceal the extreme NaNOcopy™ background, which creates a robust warning message when copied. The temperature sensitive "thermochromic" camouflage also acts as a verifier since it disappears or changes color when touched, rubbed or breathed on.

Examples of Original Transcripts Next to Their Color Copy
CLICK ON IMAGE TO SEE ENLARGED DETAIL