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"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
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Example of Original Transcript Next
to its Color Copy
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