Blank Laser Check Stock, Blue Linen pantograph, 25# Appleton DocuCheck Basic Safety Laser Check Stock. The check is at the bottom with two voucher stubs above. This laser check paper has "TonerFuse" which causes the ink to be infused into the parer making it almost impossible to be tampered with. 11 security features built into the check paper. These includes Thermochromic ink (Heat Sensitive) on the check face - Heat will fade the RED key image. And, Coin Reactive Ink in the back - Key will appear underneath Coin Image in the endorsement area when rubbed with a coin.