"Heat Reactive Verification Signature or Logo"

U.S. Patent - 5,636,874

Logo phantom and/or signature obscures when digitally scanned or photocopied. Designed for security documents where a signature or logo must be pre-printed but won't effectively be reproduced when copied. This feature also works excellent as a security verification seal by color shifting from any heat source. This has been very popular with educational institutions.

NoDupIt 'Heat Reactive Verification Signature or Logo'

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