DocuGard Security Paper is the ultimate fraud fighter with six security features. Standard 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 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.