Microprint Endorsement Lines: The border on the front of the check has lines that are formed by printed words so small that they appear as a solid line or pattern to the naked eye. Under magnification the words appear. This level of detail cannot be replicated by most copiers or desktop scanners.
Security Screen Watermark: Original document watermark on the back of check.
Chemically Sensitive paper: Stains or spots may appear with chemical alterations.