DocuGard Security Paper is the ultimate fraud fighter with seven security features. Advanced medical blue paper meets and exceeds U.S. Federal CMS guidelines for tamper-resistant security paper. It is ideal for any document not authorized for duplication. Having a combination of security features is important because hidden-message technology (also known as "VOID") is the most common and least dependable with the potential of copies being made without the hidden message appearing. This paper also includes heat-sensitive ink that disappears when copied; printed watermark; microtext that is illegible when copied; colored background that shows alterations when erased; a security features listing on back; and coin-reactive ink that turns black when rubbed with a coin.