Protect your most important business documents, legal correspondence and healthcare records from fraud and identity theft. AuthentiGuardï¿½ is a "digital pantograph" hidden message security technology that appears when copied, scanned or faxed. Plain sheets look like tinted paper. White space is exposed if someone tries to erase printed text. Coin reactive feature on back of original. 24-lb. acid-free sheets. Paper Color(s): Gray; Sheet Size: 8 1/2 x 11; Paper Weight: 24 lbs.; Print Color(s): N/A.