U.S. Patents 5,344,192 - 5,695,220 - 5,826,691
U.K. Patent GB 2,276,588 A
The words SAFE, or any other message or graphic, is process ghosted onto the paper and can only be seen by:
- Marking with a dark highlighter
- Rubbing with the edge of a coin
- Holding at approximately a 45º angle towards light
- Holding at approximately a 45º angle away from light
- Holding under a fluorescent "black light"
This feature will not digitally scan, photocopy or color copy. DoubleGhost™ is an adequate security feature that, when used with a written warning, easily verifies the document is original.